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[" If "n in N" ,then "],[sum(r=0)^(n)(-1...

[" If "n in N" ,then "],[sum_(r=0)^(n)(-1)^(r)r_(r)[(1)/(2^(r))+(3^(r))/(2^(2r))+(7^(r))/(2^(3r))+...........+tomterms]

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