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[" The sum of the series "(1+2)+(1+2+2^(2))+(1+2+2^(2)+2^(3))+..." up to n terms,is "],[[" (A) "2^(" nt ")-n-4," (B) "2(2^(n)-1)-n," (C) "2^(" ati ")-" n "," (D) "2^(" att ")-1]]

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