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

1.	Look at this series: 21, 9, 21, 11, 21, 13,... What number should come next?
A.	14
B.	15
C.	21
D.	23
Answer» D. 23

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

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