RRB NTPC · Question 94
Select the number from among the given options that can replace the question mark (?) in the following series. 8, 18, 32, 50, ?
Show answer & explanation
Answer: (C) 72
Explanation
The terms are 2n²: 2 × 4 = 8, 2 × 9 = 18, 2 × 16 = 32, 2 × 25 = 50, 2 × 36 = 72.