If you're experiencing a roadblock with one of the Manhattan Prep GRE math strategy guides, help is here!
yasosnovskaya
Course Students
 
Posts: 1
Joined: Fri Sep 27, 2013 9:32 am
 

Error in 5lb book, page 552, problem 11

by yasosnovskaya Wed Apr 30, 2014 5:30 pm

5 lb. Book of GRE.
page 552, problem #11

We have 1/1 /1/(5^-2)
I definitely agree that 1/(5^-2) equals 5^2.
But then we have 1/1 /5^2, you guys can't just change the order in which this fraction was written. Even if we stupidly divide on calculator 1/1/5^2, we got 0.04, which is equivalent of 1/(5^2)! That's the true!
So, we can solve this problem in this way:
(1/1)*(1/5^2) because we have to flip the second fraction which was 5^2! So, the right answer is 1/25!
tommywallach
Manhattan Prep Staff
 
Posts: 1917
Joined: Thu Mar 31, 2011 11:18 am
 

Re: I guess it's error in your book.

by tommywallach Mon May 05, 2014 1:23 pm

Hey Yaso,

Yes, this was an error in the first edition of the book. If you ever see an error, check here (http://www.manhattanprep.com/gre/errata ... ispexams=3). This is where we list out errata. Also, always mention the question/page number in the title of your post, so others can see it (if they happened to notice the same error). I've changed this post's title for that reason.

Thanks!

-t