Look at this series: 21, 9, 21, 11, 21, 13, 21, ... What number should come next?
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Answered by
3
Answer...
The next number will be 15.
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Answered by
1
Answer:
15 should come next
look carefully 21 is present at each odd place and the numbers are increasing by 2 at even places like 9,11,13 so next numbers should be 15
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