Multiple choice

In the following number series only one number is wrong. Find out the wrong number. 16 28 36 54 81 121.5

  1. 16

  2. 36

  3. 54

  4. 28

  5. None of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The pattern is: ×1.75 alternately. 16 × 1.75 = 28, 28 × 1.75 = 49 (not 36), 36 × 1.75 = 63, 54 × 1.5 = 81, 81 × 1.5 = 121.5. Actually the pattern alternates between ×1.75 and ×1.5. 16×1.75=28, 28×1.75=49 (should be 36), so 28 is correct and 36 is wrong.

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