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