28, 25, 5, 21, 18, 5, 14, ... choose which pair of numbers comes next?

A 11, 5

B 10, 7

C 11, 8

D 5, 10

E 10, 5

Solution

Correct Answer: Option A

This is an alternating subtraction series with the interpolation of a random number, 5, as every third number. In the subtraction series, 3 is subtracted, then 4, then 3, and so on.

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