9, 12, 11, 14, 13, 16, 15, ... choose which pair of numbers comes next?
A. 14, 13
B. 18, 21
C. 14, 17
D. 12, 13
E. 18, 17
Answer: Option E
Solution (By Examveda Team)
This is a simple alternating addition and subtraction series. First, 3 is added, then 1 is subtracted, then 3 is added, 1 subtracted, and so on.This Question Belongs to Competitive Reasoning >> Number Series Completion
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