[25] Look at this series: 22, 21, 23, 22, 24, 23, … What number should come next?

For Competitive Exams

Look at this series: 22, 21, 23, 22, 24, 23, … What number should come next?

Explanation:
In this simple alternating subtraction and addition series;
1 is subtracted, then 2 is added, and so on.
Rule = (first number - 1) (second number + 2) (third number - 1) (fourth number + 2)......
Now The series is 22, 21, 23, 22, 24, 23, . . .
(22 - 1 = 21), (21 + 2 = 23), (23 - 1 = 22), (22 + 2 = 24), (24 - 1 = 23) (23 + 2 = 25)...
So the answer is c = 25.

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