Which of the following numbers will replace the question mark (?) in the given series?
2, 6, 12, 20, 30, 42, 56, 72,?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 90.
2 + 4 = 6; 6 + 6 = 12; 12 + 8 = 20; 20 + 10 = 30; 30 + 12 = 42; 42 + 14 = 56; 56 + 16 = 72; 72 + 18 = 90