Select the number from among the given options that can replace the question mark (?) in the following series.
21, 32, 54, ?, 131
Show answer & explanation
Correct answer: D
Explanation
The correct answer is Option 4 i.e. 87
Given series: 21, 32, 54, ?, 131
The logic used here is:
21, 32, 54, ?, 131
21 + 11 = 32
32 + 22 = 54
54 + 33 = 87
87 + 44 = 131
Hence, 87 is the correct answer.