Multiple choice

Identify the wrong number in the following series. 216, 163, 120, 72, 24

  1. 216

  2. 163

  3. 72

  4. 214
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The series pattern is 6³-0=216, 5³-?=?, 4³-56=120-56=64 (not 72), 3³-27=27, 2³-8=0. Alternatively: 216, 216-53=163, 163-43=120, 120-48=72 (break), 72-48=24. The pattern is imperfect. However, 163 is the most clearly wrong - it should be 125 (5³) to complete a perfect cube series 6³,5³,4³,3³,2³.

Keep practicing — related questions