Which of the following numbers will replace the question marks (?) in the given series?
11, 33, 66, 110, 165,?,?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 231, 308.
11 + 22 = 33; 33 + 33 = 66; 66 + 44 = 110; 110 + 55 = 165; 165 + 66 = 231; 231 + 77 = 308