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

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Question

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

Options:

A . 14

B . 15

C . 21

D . 23

Answer: Option B
Answer: (b).15

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