GMAT Practice Question Set #40 (Question 118-120)

Problem Solving Question #119: Combining Integers: Even or Odd  
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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

(A)

None

(B)

I only

(C)

II only

(D)

III only

(E)

I, II, and III

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