Select the number that can replace the question mark (?) in the following series.
3, 12, 36, 80, ?, 248
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 149.
Given series is 3, 12, 36, 80, ?, 248
The pattern is,
12 - 3 = 9
36 - 12 = 24
80 - 36 = 44
149 - 80 = 69
248 - 149 = 99
double difference is shown below:
24 - 9 = 15
44 - 24 = 20
69 - 44 = 25
99 - 69 = 30
Hence, the correct answer is 149.