GMAT Quantitative Reasoning Practice Test 1

Question : 23 of 100

Marks: +1, -0

X is an even number and Y is a positive odd number. Which of the following expressions cannot be even?

Solution:

The fastest way to solve this problem is by plugging in some numbers. Let's say:

X=2, Y=1

.
According to answer e:

1 × 1=1

and that must be an odd number.

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