Multiple choice

If a is an odd integer and b is an even integer, which of the following is an even integer?

  1. 3( a + b)

  2. ab2

  3. ab – 1

  4. a2 – b

  5. b2 – a
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Let a = 3 and b = 2. Then, starting from (5), the choices are (4 – 3 = 1), (9 – 2 = 7), (6 – 1 = 5), (3 x 22 = 12) and {3(3 + 2) = 15}. Of these, only the second choice  is an even integer.

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