[amp_mcq option1=”14 and 60″ option2=”13 and 63″ option3=”15 and 60″ option4=”15 and 63″ correct=”option3″]
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.