Find the missing number in the series.
21, (...) , 22, 36, 23, 37

Correct option is B

Given series: 21, (...), 22, 36, 23, 37
We can observe that the series alternates between a pattern involving two sequences:
First sequence: 21, 22, 23 (increases by 1 each step)
Second sequence: 36, 37 (increases by 1 each step)
To maintain this pattern, the missing number should follow the alternating sequence:
The first sequence goes: 21, 22, 23.
The second sequence goes: (...), 36, 37.
To find the missing number, the pattern suggests that the number before 36 should be 35.
Thus, the missing number in the series is: (b) 35.