Which of the following numbers will replace the question mark (?) in the given series?
6, 10, 15, 21, ?, 36, 45
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 28.
Given: 6, 10, 15, 21, ?, 36, 45
6 + 4 = 10
10 + 5 = 15
15 + 6 = 21
21 + 7 = 28
28 + 8 = 36
36 + 9 = 45
Hence, the correct answer is "28".