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

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Question 550150: Look at the series: 21,9,21,11,21,13,,21, ..What number should come next
Answer by fcabanski(1391) About Me  (Show Source):
You can put this solution on YOUR website!
The numbers following 21 increase by 2: 9, 11, 13...


The next number is 15.

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