What number should replace the question mark (?) in the series given below? 5, 9, 15, 23, 33, ?

A43

B45 ✓ Correct

C56

D66

Correct answer: (B) 45

Explanation

The missing number is 45.

The differences between terms grow by 2 each step.

9-5=4, 15-9=6, 23-15=8, 33-23=10.

The next difference is 10 + 2 = 12.

33 + 12 = 45.

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