Find the missing number in the following series.
11, 13, 20, 48, 111, ?
Show answer & explanation
Correct answer: B
Explanation
The pattern of differences between consecutive terms is as follows:
• 13 − 11 = 2 = 13 + 1
• 20 − 13 = 7 = 23 − 1
• 48 − 20 = 28 = 33 + 1
• 111 − 48 = 63 = 43 − 1
Following this pattern, the next difference must be:
53 + 1 = 125 + 1 = 126
Therefore, the missing number is:
111 + 126 = 237