RRB NTPC · Question 99
Select the number that can replace the question mark (?) in the following series. 5, 10, 17, 26, ?
Show answer & explanation
Answer: (A) 37
Explanation
Each term is n² + 1: 2² + 1 = 5, 3² + 1 = 10, 4² + 1 = 17, 5² + 1 = 26, 6² + 1 = 37.