by mahinur.alam Thu Dec 26, 2013 10:41 pm
Hello friends! I found the following in 500 GRE Math Flash Cards: x is divisible by 42. Which of the following numbers is definitely a factor of x-squared? chose ALL that apply. (A) 63, (B)33, (C) 36, (D) 8, (E) 42. The answers provided by the book were (A) 63, (C) 36. Can anyone argue why 42 is not an answer as well?