Which number will replace the question mark (?) in the following series?
19, 21, ?, 134, 538, 2692
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 44.
19 × 1 + 2 = 21, 21 × 2 + 2 = 44, 44 × 3 + 2 = 134, 134 × 4 + 2 = 538, 538 × 5 + 2 = 2692