VJesus12 wrote: ↑Sat Sep 25, 2021 3:11 am
Is the integer \(k\) a prime number?
(1) \(2k = 6\)
(2) \(1 < k < 6\)
Answer:
A
Source: Official Guide
Target question: Is k a prime number?
Given: k is an integer
Statement 1: 2k = 6
Solve to get: k = 3
3 is a prime number, so the answer to the target question is
YES, k IS a prime number
Since we can answer the
target question with certainty, statement 1 is SUFFICIENT
Statement 2: 1 < k < 6
There are several values of k that satisfy statement 2. Here are two:
Case a: k COULD equal 2, in which case, the answer to the target question is
YES, k IS a prime number
Case b: k COULD equal 4, in which case, the answer to the target question is
NO, k is NOT a prime number
Since we cannot answer the
target question with certainty, statement 2 is NOT SUFFICIENT
Answer: A
Cheers,
Brent
Brent Hanneson - Creator of GMATPrepNow.com
