Source: Official Guide for the GMAT 13th Ed. Data Sufficiency; #27 Official Guide for the GMAT 2015 14th Ed. Data Sufficiency; #27

1

If n is an integer, is n

If n is an integer, is n even?

4 Explanations

1

Gravatar Hannah Baker, Magoosh Tutor

Hi Andy,
You're right that the prompt doesn't specify positive integers. But while 0 is neither positive nor negative, it IS even! So statement 1 is still sufficient in this case :)

Nov 2, 2015 • Comment

1

Michael Torre

On statement 1, what if you decided to test taking the square root of N^2 and square root of the even side of the equation. You would get n= Square root of an even integer. It works for numbers like 4 and 26 but if you take the square root of the number two you get an undefined number. Wouldn't this make the problem Insufficient?

Aug 29, 2015 • Comment

Jonathan , Magoosh Tutor

Hi Michael. Remember that we're told that n is an integer. So n cannot equal ?2. I hope that clarifies.

Sep 1, 2015 • Reply

1

saadi agha

Very silly mistake- Intersting way to solve this:
n*2-1 +1=odd+1 therefore;
n*2=Even

Feb 8, 2015 • Comment

Jonathan , Magoosh Tutor

I think you mean:

n^2 = even, therefore n must be even.

If so, you are correct :)

Feb 23, 2015 • Reply

3

Gravatar Mike McGarry, Magoosh Tutor

Dec 31, 2013 • Comment

Andy Pierre

1) Why n can't be 0 and therefore the statement 1 would be insufficient? The prompts doesnt specify positive integers.

Sep 17, 2014 • Reply

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Section 6.3 Data Sufficiency

Section 6.3 Data Sufficiency

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