Select the number from among the given options that can replace the question mark (?) in the following series.
15, 15, 17, 51, 55, ?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 275.
Given series: 15, 15, 17, 51, 55, ?
15 × 1 = 15
15 + 2 = 17
17 × 3 = 51
51 + 4 = 55
55 × 5 = 275