Look at the series: 31, 29, 24, 22, 17, __ What number should come next?

Look at the series: 31, 29, 24, 22, 17, __ What number should come next?

A 12

B 13

C 14

D 15

Solution

Correct Answer: Option D

This is a simple alternating subtraction series, which subtracts 2, then 5.