Select the number from among the given options that can replace the question mark (?) in the following series.
4, 10, 23, 67, 137, ?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 409.
4, 10, 23, 67, 137, ?
4 × 3 − 2 = 12 − 2 = 10
10 × 2 + 3 = 20 + 3 = 23
23 × 3 − 2 = 69 − 2 = 67
67 × 2 + 3 = 134 + 3 = 137
137 × 3 − 2 = 411 − 2 = 409