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1/3+1/9+1/27+...+1/3^n = 1/3*1/(1-1/3)=1/3*3/2=1/2
1/5+1/25+1/125+...+1/5^n = 1/5*1/(1-1/5)=1/5*5/4=1/4
lim {an} = 1/2 : 1/4= 1/2 * 4 = 2
n → ∞