Multiple choice

Directions: Complete the series.

1, 2, 6, 15, 31, 56, ?

  1. 92

  2. 57

  3. 60

  4. 65

  5. 72
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

As it is clear from the series, every term is incremented by the squares of consecutive natural numbers.

1 + 12 = 2 2 + 22 = 6 6 + 32 = 15 15 + 42 = 31

31 + 52 = 56 Similarly, 56 + 62 = 92

Keep practicing — related questions