Find the missing term in the following series.
1, 2, 6, 15, 31, ?
Show answer & explanation
Correct answer: C
Explanation
The given number series follows the pattern of adding consecutive square numbers:
• 1 + 12 = 1 + 1 = 2
• 2 + 22 = 2 + 4 = 6
• 6 + 32 = 6 + 9 = 15
• 15 + 42 = 15 + 16 = 31
• 31 + 52 = 31 + 25 = 56
Therefore, the missing term is 56.