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Last Updated on May 11, 2023
GMAT OFFICIAL GUIDE DS
Solution:
We need to determine whether a + b + 3 is odd, or in other words, whether a + b is even.
Statement One Alone:
ab is an odd integer.
Because ab is odd, we know that a and b must both be odd, and since odd + odd = even, a + b is even. Statement one alone is sufficient to answer the question.
Statement Two Alone:
a – b is an even integer.
Since a – b is even, a + b is also even. Statement two alone is sufficient.
Answer: D
