Which of the following numbers will replace the question mark (?) in the given series?
4, 8, 5, ?, 15, 90
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 20.
Given series: 4, 8, 5, ?, 15, 90
4 × 2 = 8, 8 - 3 = 5, 5 × 4 = 20, 20 - 5 = 15, 15 × 6 = 90