Numerical Ability Mcq Question

  1. If a and b are integers and a – b is even, which of the following must always be even?
  1. ab
  2. a² + b² + 1
  3. a² + b + 1
  4. ab – b²
Correct Option : D

As a – b is even so a and b will be both even or both odd. Hence, option (d) will be the right answer.

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