14 and 60
13 and 63
15 and 60
15 and 63
Answer is Right!
Answer is Wrong!
The correct answer is (c) 15 and 60.
The series is 1, 3, 7, 15, 31, 63, …
Each number in the series is the sum of the two numbers before it.
So, the missing numbers are 15 and 60.