Select the number from among the given options that can replace the question mark (?) in the following series.
15, 20, 45, 170, ?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2, i.e., 795.
20 - 15 = 5, (5)1
45 - 20 = 25, (5)2
170 - 45 = 125, (5)3
795 - 170 = 625 = (5)4