We invite you to test your GMAT knowledge for a chance to win! Each week, we will post a new Challenge Problem for you to attempt. If you submit the correct answer, you will be entered into that week’s drawing for a free Manhattan GMAT Prep item. Tell your friends to get out their scrap paper and start solving!

Here is this week’s problem:

Can you find the most efficient way to solve this problem?

Gita, Hussain, Inge, Jeong, Karen, and Leila are seated in a row of six chairs. How many seating arrangements are possible if Gita cannot sit next to Inge and Jeong must sit next to Leila?

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Here are the free GMAT events we’re holding this week. All times are local unless otherwise specified.

Remember, our Black Friday GMAT special ends on December 15th. Receive $150 off all December GMAT courses will the code BLACKFRIDAY150.

12/8/13– Online – Free Trial Class-  7:00AM- 10:30AM (EST)

12/8/13- Washington, DC- Free Trial Class– 10:30PM- 1:30PM

12/8/13-New York, NY- Free Trial Class– 5:30PM- 8:30PM

12/8/13–  Irvine, CA- Free Trial Class– 5:30PM- 8:30PM

12/8/13– San Francisco, CA- Free Trial Class – 2:00PM- 5:00PM

12/8/13– Santa Monica, CA- Free Trial Class– 10:00AM- 1:00PM

12/8/13– San Diego, CA – Free Trial Class-  11:00AM- 2:00PM

12/8/13– London-Free Trial Class- 10:00AM- 1:00PM

12/8/13– Online- Free Trial Class– 8:30AM- 11:30PM (EST)

12/8/13- Boston, MA- Free Trial Class– 5:30PM- 8:30PM

12/8/13-Toronto, ON-  Free Trial Class– 2:00PM- 5:00PM

12/9/13 –  Bellaire, TX- Free Trial Class– 6:30PM- 9:30PM

12/10/13– Online- The Last-Minute MBA Application presented by mbaMission – 3:00PM- 4:30PM (EST)

12/10/13– Santa Clara, CA- Free Trial Class– 6:30AM- 9:30PM

12/10/13– Online – Free Trial Class-  3:00PM- 6:00PM (EST)

12/11/13– Philadelphia, PA-Free Trial Class- 6:30PM- 9:30PM

12/14/13– Online- Free Trial Class- 2:30PM- 5:30PM

Looking for more free events? Check out our Free Events Listings Page.

We are very excited to announce that our new book, The Official Guide Companion for Sentence Correction, will hit bookshelve today, December 3^rd!

What is the OGSC (for short)?

It’s one of the best GMAT study guides you could have (if we do say so ourselves)!

Here’s the deal: nearly everyone studies from The Official Guide for GMATÒ Review, 13^th Edition (or OG13). This book contains about 900 real GMAT questions that appeared on the exam in the past. OG13 does contain explanations, but those explanations are “textbook” explanations: reading them is like reading a grammar book. The answers are completely accurate but a bit hard to follow if you’re not a grammar teacher (and some of them are hard to follow even when you are a grammar teacher… ahem).

So we decided to remedy that problem by writing our own explanations for every single one of the 159 Sentence Correction problems contained in OG13. We’ll tell you the SC Process for getting through any SC question efficiently and effectively. We’ll also discuss how to eliminate each wrong answer in terms that are easy for students (not just teachers) to understand. The book includes an extra section on sentence structure and a glossary of common grammar terms. Finally, you’ll gain access to our online GMAT Navigator program which lets you track your OG work, time yourself, and view your performance data so that you can better determine your strengths and weaknesses.

Who should use the OGSC?

Are you struggling to improve your SC performance? Do you love studying official problems but hate trying to decipher the sometimes-mystifying official explanations? Do you want to throw your OG13 across the room when you read yet another explanation that says an answer choice is “wordy” or “awkward”?

If something is “awkward,” there is a real reason why—and we explain that specific reason to you so that you can start to pick out similar faulty constructions on other problems in future. (Did you know that, most of the time, “wordy” and “awkward” are code words for an ambiguous or illogical meaning? The OGSC will help you learn how to decipher these for yourself!)

How can I get the most out of the OGSC?

First, read the introduction chapter, where you’ll learn all about how to work through an SC problem in an efficient manner.

Next, if you have already started studying Sentence Correction problems from the OG, begin with the problems that you’ve tried recently. Try to articulate to yourself why each of the four wrong answers is wrong. Try to find all of the errors in each answer (though, on the real test, just one error is enough to eliminate an answer!).

Note: You don’t need to use grammar terminology when you’re trying to articulate why something’s wrong, but do try to go beyond “this one sounds bad.” That’s a good starting point but which part, specifically, sounds bad? What sounds so bad about that part?

Then, check yourself against the explanations. If you didn’t spot a particular error, go back to the problem and ask yourself what clues (in the form of differences in the answer choices) will alert you the next time this particular topic is being tested. If you didn’t know how to handle the issue but now understand from the explanation, make yourself a flashcard to help you remember whatever that is for future. If the explanation seems like Greek to you, then maybe this particular issue is too hard and your take-away is to skip something like this in future and make a guess!

When you’re ready to try new OG problems, make sure to do them under timed conditions (try to average about 1 minute 20 seconds on SC). When you’re done, check the answer. If you guessed, go ahead straight to the explanation. If you got it right, try to articulate why each incorrect answer is wrong, then check the explanation. If you got it wrong, look at the problem again to see whether you might have made a careless mistake. Then go to the explanation.

Where can I get the OGSC?

You can find The Official Guide Companion for Sentence Correction on our website starting today!

Let us know what you think in the Comments section below. Good luck and happy studying!

Below is an excerpt from Andrew Yang‘s new book, Smart People Should Build Things: How to Restore Our Culture of Achievement, Build a Path for Entrepreneurs, and Create New Jobs in America, which comes out in February 2014. Andrew was named Managing Director of Manhattan GMAT in 2006, Chief Executive Officer in 2007, and President in 2010. He left Manhattan GMAT in 2010 to start Venture for America, where he now serves as Founder and CEO. 

Smart People Should Build Things. 

I believe there’s a basic solution to our country’s economic and social problems. We need to get our smart people building things (again). They’re not really doing it right now. They’d like to. But they’re being led down certain paths during and after college and told not to worry, they can figure it out later.

Take me, for instance. I wasn’t very enterprising when I graduated from Brown in 1996. I had a general desire to be smart, accomplished, and successful—whatever that meant. So I went to law school and became a corporate attorney in New York. I figured out I was in the wrong place after a number of months working at the law firm. I left in less than a year and cofounded a dot-com company, Stargiving, which helped raise money for celebrity-affiliated nonprofits. It was extraordinarily difficult. My company failed spectacularly, but I recovered. I went to work for a mobile software company, Crisp Wireless, and then a health care software company, MMF Systems, over the next five years, eventually becoming the CEO of a test-prep company, Manhattan GMAT, in 2006.

I spent five years running Manhattan GMAT, helping young people get into business school. I taught our corporate classes of investment banking analysts and consultants at Goldman Sachs, McKinsey and Company, JPMorgan Chase, Morgan Stanley, and Deloitte, as well as hundreds of individual students over the years. Some were exactly where they wanted to be. But there seemed to be just as many top-notch young people who wondered why they didn’t like their jobs more. They sought a higher sense of engagement with their work and their careers. Sometimes they would put words to what they were looking for; they’d say they wanted “something entrepreneurial” or “to be really excited about something.”
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We invite you to test your GMAT knowledge for a chance to win! Each week, we will post a new Challenge Problem for you to attempt. If you submit the correct answer, you will be entered into that week’s drawing for a free Manhattan GMAT Prep item. Tell your friends to get out their scrap paper and start solving!

Here is this week’s problem:

An isosceles triangle with one angle of 120° is inscribed in a circle of radius 2. This triangle is rotated 90° about the center of the circle. What is the total area covered by the triangle throughout this movement, from starting point to final resting point?

(A) 
(B) 
(C) 
(D) 
(E) 

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We are so excited today to announce the launch of “Oh What Fun!,” Manhattan Prep’s first-ever, 12-day holiday celebration! Everyday between today and December 12, 2013, we will be offering exciting promotions, gifts, and contests that are inspired by the spirit and joy of the holiday season.

“Oh What Fun!” deals include $150 off GMAT, LSAT, and GRE courses in the month of December, 50% off strategy guides, free workshops, and Amazon giftcards, offering you unbeatable prices and more ways to save throughout the holiday season.

Here’s how it works: Everyday beginning today and running through December 12, 2013, we will unlock one holiday offer per day for our social media communities. We invite you to come join the fun on Facebook and Twitter so that you don’t miss any of our student-focused holiday deals! You can also use the hashtag #ohwhatfun to connect with us and the entire Manhattan Prep community this holiday season.

The giveaway begins today and we’re offering 50% off our of our individual GMAT Strategy Guides as well as The Official Guide Companion for Sentence Correction, 13th Edition and The Official Guide Companion, 13th ed. Head on over to our GMAT Facebook page to redeem today’s code and to read the terms and conditions.

We hope you’re as excited as we are for this beautiful time of year. Oh what fun this is going to be! 

Here are the free GMAT events we’re holding this week. All times are local unless otherwise specified.

Remember, our Black Friday GMAT special ends on December 15th. Receive $150 off all December GMAT courses will the code BLACKFRIDAY150.

12/2/13– Chicago, IL – Free Trial Class-  6:30PM- 9:30PM

12/3/13- Washington, DC- Free Trial Class– 6:30PM- 9:30PM

12/3/13-Seattle, WA- Free Trial Class– 6:30PM- 9:30PM

12/3/13–  New York, NY- Free Trial Class– 6:30PM- 9:30PM

12/4/13– Online- Free Trial Class – 8:00PM- 11:00PM (EST)

12/4/13– Santa Monica, CA- Free Trial Class– 6:30PM- 9:30PM

12/4/13– Boston, MA – Free Trial Class-  6:30PM- 9:30PM

12/4/13– New York, NY-Free Trial Class-  6:30PM- 9:30PM

12/7/13– New York, NY- Free Trial Class– 2:00PM- 5:00PM (

Looking for more free events? Check out our Free Events Listings Page.

Happy Black Friday! In case you’re too full of turkey and stuffing to make your way out to the shops today, we’re serving up something extra special. Today through December 15th, we’re offering $150 off all of our December GMAT, LSAT, and GRE courses*! This deal includes all Complete Courses– in-person as well as Live-Online. To receive this limited-time discount, register for a course that starts in December and enter the code “BLACKFRIDAY150” at checkout.

This is only the beginning of the holiday season, which means we have many more amazing things coming your way. Be sure to check back next week when we unlock our most student-focused holiday campaign. You can also follow us on Facebook and Twitter to keep up with everything happening at Manhattan Prep. Oh what fun this is going to be!

*Offer is valid for courses starting in the month of December only. Not valid for students currently registered for courses, or with any additional offers. Offer expires 12/15/2013 for GMAT courses.

We’ve been on a CR kick lately! In the first two parts of this series, we talked about how to tackle Fill in the Blank and Complete the Passage questions. This time, I’ve got something different for you: a question that looks very familiar at first glance but turns a bit… well, weird.

Let’s try it before I say anything more. This GMATPrep© problem is from the two free exams that come with the GMATPrep software. Give yourself about 2 minutes (though it’s okay to stretch to 2.5 minutes on a CR as long as you are making progress.)

“On of the limiting factors in human physical performance is the amount of oxygen that is absorbed by muscles from the bloodstream. Accordingly, entrepreneurs have begun selling at gymnasiums and health clubs bottles of drinking water, labeled “SuperOXY,” that has extra oxygen dissolved in the water. Such water would be useless in improving physical performance, however, since the amount of oxygen in the blood of someone who is exercising is already more than the muscle cells can absorb.

Which of the following, if true, would serve the same function in the argument as the statement in boldface?

“(A) world-class athletes turn in record performances without such water
“(B) frequent physical exercise increases the body’s ability to take in and use oxygen
“(C) the only way to get oxygen into the bloodstream so that it can be absorbed by the muscles is through the lungs
“(D) lack of oxygen is not the only factor limiting human physical performance
“(E) the water lost in exercising can be replaced with ordinary tap water”

Step 1: Identify the Question

The boldface font is immediately obvious, of course. Boldface denotes a Describe the Role question.

The question stem does have one little idiosyncrasy, though: it asks what answer would serve the same function. Normally, Role questions ask what function the boldface statement plays in the argument. The question stem also contains “if true” wording, which we normally see on Strengthen, Weaken, or Discrepancy (paradox) questions.

Glance at the answers. Notice anything? This is not what Role answers typically look like! Usually they say something such as “The statement provides evidence supporting the author’s claim” or similar.

What’s going on here? Read the argument.

Step 2: Deconstruct the Argument

Here’s what I thought and wrote while I did the problem. Your own thought process won’t be exactly the same as mine and, of course, your notes will probably look quite different, since we all have our own ways of abbreviating things. (Note: R = role; note that I put a question mark next to it because I wasn’t 100% sure what was actually going on).

So back to that weird question stem. If this were just a straight Role question, then what would the answer be? The boldface statement is support for the conclusion; it’s a premise.

But what’s the goal for this question?

Step 3: State the Goal

The answers don’t describe the existing boldface statement. Rather, they contain new facts that we’re supposed to accept as true. Further, the question asked us to find an answer that “would serve the same function” as the original statement.

What function did the original statement serve? Aha! The original statement served as a premise to support the conclusion. So we need to find another statement that serves that same purpose.

Will it support the conclusion in exactly the same way? I’m really not sure. (Seriously! When I first saw this question, I didn’t know!) So I’m going to keep an open mind and look for anything that could support the conclusion in general.

Work from Wrong to Right

The correct answer is (C).

Interesting. We just learned something new. Most Describe the Role (or Boldface) questions ask us to describe the role of the given statement. We might be asked, though, to demonstrate our knowledge of the role by finding a different, completely new statement that serves the same role as the original statement in the argument.

What do we have to do? We have to “decode” the original statement (in the above case, we had a premise supporting the conclusion) and then we have to find another statement that could also serve as a premise.

That new premise might be really different from the original premise. In this problem, the original premise focused on the oxygen already in our blood. The new premise, answer (C), provided a different piece of the puzzle: we have to take oxygen in through our lungs in order to get that oxygen into the bloodstream. Either piece of information serves to support the idea that OXY is useless, but each does so in different ways.

Take-aways for “Same Function As” Role Questions:

(1) The standard task on role questions is to describe the role of the statement given in the argument.

(2) You might see a variation on this standard task: you may be asked to find a new statement that plays the same role as the original.

(3) This new statement may discuss a different aspect of the argument. That’s perfectly all right as long as the statement overall plays the same role as the original boldface statement.

* GMATPrep® questions courtesy of the Graduate Management Admissions Council. Usage of this question does not imply endorsement by GMAC.

“Last time, we talked about Fill in the Blank CR questions: what are they and how do we tackle them efficiently? If you haven’t already read that article, go ahead and do so.

Then, come back here and test your new-found skills on this GMATPrep© problem (it’s from the two free exams). Give yourself about 2 minutes (though it’s okay to stretch to 2.5 minutes on a CR as long as you are making progress.)

“Which of the following best completes the argument?

“A new machine for harvesting corn will allow rows to be planted only fifteen inches apart, instead of the usual thirty inches. Corn planted this closely will produce lower yields per plant. Nevertheless, the new machine will allow corn growers to double their profits per acre because ________________

“(A) with the closer spacing of the rows, the growing corn plants will quickly form a dense canopy of leaves, which will, by shading the ground, minimize the need for costly weed control and irrigation

“(B) with the closer spacing of the rows, corn plants will be forced to grow taller because of increased competition for sunlight from neighboring corn plants

“(C) with the larger number of plants growing per acre, more fertilizer will be required

“(D) with the spacing between rows cut by half, the number of plants grown per acre will almost double

“(E) with the closer spacing of the rows, the acreage on which corn is planted will be utilized much more intensively than it was before, requiring more frequent fallow years in which corn fields are left unplanted”

Step 1: Identify the Question

The blank line tell us that we have an argument in the “complete the passage” format.

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