Which of the following numbers will replace the question mark (?) in the given series?
33, ?, 32, 44, 31, 45

Correct option is C

The given series: 33, ?, 32, 44, 31, 45
We can observe two alternating sequences here:
First sequence: 33, 32, 31
The pattern is decreasing by 1 each time:
33 → 32 → 31,
Second sequence: ?, 44, 45
This sequence is increasing by 1:
44 → 45, so the missing number must be 43 to fit the overall pattern.
Thus, the correct number to replace the question mark is 43.
The correct answer is (c) 43.