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In "Number Series" question, a number series is given with one term missing. Choose the correct alternative that will same pattern and fill in the blank spaces

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

Option:
A. 22
B. 24
C. 25
D. 26
Answer: C . 25

Justification:

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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