Explanation
We should always be pleased to see a question that deals
with even and odd numbers, because there are rules that apply to arithmetic
operations with these numbers, and you don't even really have to remember the
rules, because you can easily try numbers to recall them. We want to know
whether m-1 is even, or, in other
words, whether m is odd. For example,
we look at Statement (1) alone. If m+3
is even, then it could be 6, say. In that case, m is 3, which means it's odd. To pick another case, if m+3 is 8, then m is 5--still odd. It will always be odd, because the only way to
add an odd number to another, missing, number and obtain an even number as a
result is if the missing number is odd. Therefore, we have sufficient
information from Statement (1) to answer the question definitively (it doesn't
matter whether the answer is Yes or No, so long as it's definitive). So
Statement (1) is sufficient. Statement (2) is sufficient by the same logic.
The correct answer is (D).
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