sum of the series 1+3+9+27+... is 324. number of series is
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it's in Gp
1 ( 3 ^n -1)/(3-1) = 324
( 3^n -1) = 648
3^n = 649
1 ( 3 ^n -1)/(3-1) = 324
( 3^n -1) = 648
3^n = 649
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