If k and t are integers and k2 - t2is an odd integer, which of the following must be an even integer?
I. k + t + 2 II. k2 + 2kt + t2 III. k2 + t2
I, II, and III
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A GMAT expression that combines to variables is given and you must find what other variations of those same two variables give you an even integer.
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