9, 11, 33, 13, 15, 33, 17, ... choose which pair of numbers comes next?

A 19, 33

B 33, 35

C 33, 19

D 15, 33

E 19, 21

Solution

Correct Answer: Option A

In this alternating repetition series, a random number, 33, is interpolated every third number into a simple addition series, in which each number increases by 2.

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