Question 33

In the following question, select the missing number from the given series.
11, 13, 16, 18, 21, ?

Solution

'2' and '3' are alternatively added.

11 + 2 = 13

13 + 3 = 16

16 + 2 = 18

18 + 3 = 21

21 + 2 = 23

=> Ans - (D)

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