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21 9 21 11 21 13 21 What number should come...

This question belongs to Competitive Reasoning Number Series Completion
Number Series Completion
?

21, 9, 21, 11, 21, 13, 21, ... What number should come next?

Answer & Solution
Correct Answer: Option B
In this alternating repetition series, the random number 21 is interpolated every other number into an otherwise simple addition series that increases by 2, beginning with the number 9.
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