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Review: Cannot Be Odd
Explanation
The mathematical definition of even and odd is that even
numbers are divisible by 2, while odd numbers are not divisible by 2. Therefore,
we can see that answer choice (C) cannot be odd. Dividing 
by 2 will yield n, and we know n is an
integer. Therefore, cannot be odd.
An alternate way to solve this question is to analyze by
cases. When looking at a specific answer choice, if you can pick a legal value
of n so that it is odd, then it can be odd, and you know that it's not
the correct answer to the question. In this fashion, you can eliminate all the
answer choices other than (C). The correct answer is (C).
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