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1/2^1+1/2^2+1/2^3+.+1/2^n =1/2^1 *[1-(1/2)^n]/(1-1/2) =1-(1/2)^n 用的是等比數列前n項的求和公式, Sn=a1(1-q^n)/(1-q) 這時公比為1/2,項數為n.
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