wat will be the next number in the series....
1,3,5,9,12,21,..
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Answer Posted / hardik j parekh
ans. : 30
9 is center point.
first three digits i.e. 1+3+5=9 and the difference between 1,3 and 3,5 is 2.
same as if we take 30 as a next number in the series, the series will be 12,21,30. now 30-21=9 and 21-12=9. again 9 comes in center.
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