Multiple choice

Find out the wrong number in the following series . 2 7 3 27 4 64 5 125

  1. 27

  2. 5

  3. 7

  4. 125

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The series alternates between a number and its cube: 2^3=8 (not 7), 3^3=27, 4^3=64, 5^3=125. The first pair is wrong - it should be 2 and 8, not 2 and 7. Therefore 7 is the wrong number in the series.