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Source: — Data Sufficiency |

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by Brent@GMATPrepNow » Sat Apr 06, 2013 8:33 am
puneet2329 wrote:question from GMAT: Can some one please explain the answer

p is a integer grater than 1, is p a prime number?

1) p is a factor of 13

2) p is a factor of 78
Target question: Is p a prime number?

Statement 1: p is a factor of 13
There are only 2 positive factors of 13. They are 1 and 13.
Since we're told that p > 1, we can be certain that p = 13
Since we can answer the target question with certainty, statement 1 is SUFFICIENT

Statement 2: p is a factor of 78
There are several values of p that meet this condition.
p could equal 2 or 3 or 13 or ...
Since we cannot answer the target question with certainty, statement 2 is NOT SUFFICIENT

Answer = A

Cheers,
Brent
Brent Hanneson - Creator of GMATPrepNow.com
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