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Question

Look at this series 21,9,21,11,21,13,... What number should come next ?


A

14

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B

15

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C

21

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D

23

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Solution

The correct option is C

21


Explanation of the correct option.

Compute the next number of the series.

Given: 21,9,21,11,21,13,...

The fourth term of the series can be derived by adding 2 in the second term,

11=9+2

The sixth term of the series can be derived by adding 2 in the fourth term,

13=11+2

We can see that in the given series random number 21 is repeated alternately or at each odd's place.

Hence, the next number of the series is 21.

Option C is the correct answer.


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