Question 21

Which number will replace the question mark (?) in the following series?
16, 18, 21, 26, 33, ?

Solution

18 - 16 = 2

21 - 18 = 3

26 - 21 = 5

33 - 26 = 7

The difference between the consecutive numbers of the series is a prime number series and the next prime number is 11

$$=$$> Next number of the series = 33 + 11 = 44

Hence, the correct answer is Option A

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Which number will replace the question mark (?) in the following series?16, 18, 21, 26, 33, ?