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Source: — Data Sufficiency |

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by [email protected] » Sat Oct 24, 2015 11:41 am
Hi oquiella,

This question can be solved with a mix of TESTing VALUES and/or Number Properties.

We're told that X and Y are POSITIVE INTEGERS. We're asked if Y is ODD. This is a YES/NO question.

1) X is ODD.

This tells us NOTHING about the value of Y. Y could be odd (and the answer to the question is YES) or even (and the answer to the question is NO).
Fact 1 is INSUFFICIENT

2) XY is ODD.

For the product to be ODD, BOTH X and Y must be odd.

For example:
(3)(5) = 15 = odd
(3)(4) = 12 = NOT odd
(2)(4) = 8 = NOT odd

Thus, Y is ALWAYS ODD and the answer to the question is ALWAYS YES.
Fact 2 is SUFFICIENT

Final Answer: B

GMAT assassins aren't born, they're made,
Rich
Contact Rich at [email protected]
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