Source: Official Guide for GMAT Review 2016 Data Sufficiency ; #125

1

If x and y are integers, is xy

If x and y are integers, is xy even?

2 Explanations

1

ZOE ZHUYAN

hi tutors,
I picked up B, because I think that state 1 is not sufficient and that state 2 is sufficient
I can get some examples for state 1 as following:
for example, X=1, Y=0, then XY = 0, which is not even
for example ,X=2, Y=1, then XY = 2, which is even.

please point out my fault.

thank a lot
have a nice day
>_~

Nov 1, 2016 • Comment

Sam Kinsman, Magoosh Tutor

Hi Zoe, your reasoning here is good - just keep in mind that zero is an even number! (https://en.wikipedia.org/wiki/Parity_of_zero) So if x=1 and y=0, then xy = 0 which is even. So if S1 is true, xy must be even :)

Nov 2, 2016 • Reply

2

Gravatar Mike McGarry, Magoosh Tutor

Aug 18, 2015 • Comment

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Official Guide for GMAT Review 2016

Official Guide for the GMAT 2015 14th Ed.

Official Guide for the GMAT 13th Ed.

Official Guide for the GMAT 12th Ed.

Revised GRE PDF 2nd Ed.


Section 6.3 Data Sufficiency

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