Which of the following numbers will replace the question mark (?) in the given series?
9, 20, 42, 86, 174, ?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 350.
Given series: 9, 20, 42, 86, 174, ?
9 × 2 + 2 = 20
20 × 2 + 2 = 42
42 × 2 + 2 = 86
86 × 2 + 2 = 174
174 × 2 + 2 = 350