find the Sn of An = 1/2^n

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- Mar 2nd 2010, 06:31 AMconfusedgirlpartial sums of sequences
find the Sn of An = 1/2^n

- Mar 2nd 2010, 06:49 AMKrizalid
geometric sum for $\displaystyle a=\frac12$ where $\displaystyle \sum_{j=0}^na^j=\frac{a^{n+1}-1}{a-1}.$