GATE Mechanical Engineering 2017 | Parity Question: Which Expression is Always Even?

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Mechanical Engineering > GATE 2017 SET-2 > Quantitative Aptitude

If a and b are integers and a-b is even, which of the following must always be even?

A

ab

B

a² + b² + 1

C

a² + b + 1

D

ab - b

Correct : d

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