Search found 17 matches


great catch on the '3 x absolute value can't be neg. thing'

I was set to pick E, as I had also gotten -8 and 14 as my y values, and didn't believe that the first statement helped me eliminate either one as I could set up equations with both. Had I taken a closer look, I would have noticed that 3|x2 – 4| = y – 2 is only possible for +14 because 3|x2 – 4| MUST...

by Edthesock

Tue Jan 20, 2009 6:28 pm
Forum: Data Sufficiency
Topic: Need Help with Manhattan Gmat question
Replies: 12
Views: 1988

Factorials - Data Sufficiency problem

If x is a positive integer, is x! + (x + 1) a prime number? (1) x < 10 (2) x is even The only way I was able to solve this was to do every factorial up to 9 and see if any of them were prime/not prime after adding x+1. Obviously, this is inefficient and certainly not how it is to be solved... any he...

by Edthesock

Tue Jan 20, 2009 5:15 pm
Forum: Problem Solving
Topic: Factorials - Data Sufficiency problem
Replies: 1
Views: 1166