Find the number that can replace question mark (?) in the series given below.…
2023
Find the number that can replace question mark (?) in the series given below.
1, 3, 2, 5, 3, 7, 4, 9, 5, 11, 6, 13 ?
- A.
15
- B.
7
- C.
19
- D.
8
Attempted by 55 students.
Show answer & explanation
Correct answer: B
This series consists of two interleaved patterns. The terms at odd positions (1st, 3rd, etc.) increase by 1: 1, 2, 3, 4, 5, 6. The terms at even positions are consecutive odd numbers: 3, 5, 7... Since the question mark is at position 13 (odd), it follows the first pattern. The next number after 6 is 7.