8, 11, 21, 15, 18, 21, 22, ... choose which pair of numbers comes next?

Ritu Singhal • 4.36K Points
Extraordinary Reasoning

Q. 8, 11, 21, 15, 18, 21, 22, ... choose which pair of numbers comes next?

(A) 25, 18
(B) 25, 21
(C) 25, 29
(D) 25, 29 D. 24, 21

Correct Answer - Option(B)

Explanation by: Ritu Singhal

This is an alternating addition series, with a random number, 21, interpolated as every third number. The addition series alternates between adding 3 and adding 4. The number 21 appears after each number arrived at by adding 3.

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