Hi All,

While it might be easy to run through this question without taking any notes (and still get it correct), there's something to be said for practicing to PROVE that your answer is correct. This level of attention to detail will help you to hone your skills on ALL DS questions.

We're told that N and K are positive integers. We're asked if N/K is an EVEN INTEGER. This is a YES/NO question.

Fact 1: N is divisible by 8

IF....

N = 8

K = 1

Then 8/1 = 8 and the answer to the question is YES

IF....

N = 8

K = 8

Then 8/8 = 1 and the answer to the question is NO

Fact 1 is INSUFFICIENT

Fact 2: K is divisible by 4

IF....

N = 8

K = 4

Then 8/4 = 2 and the answer to the question is YES

IF...

N = 7

K = 4

Then 7/4 = 1.75 and the answer to the question is NO

Fact 2 is INSUFFICIENT

Combined, we know...

N is divisible by 8

K is divisible by 4

IF....

N = 8

K = 4

Then 8/4 = 2 and the answer to the question is YES

IF....

N = 8

K = 8

8/8 = 1 and the answer to the question is NO

Combined, INSUFFICIENT

Final Answer:

GMAT assassins aren't born, they're made,

Rich

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# Rich Cohen

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