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[" 88the value of "sum(k=1)^(n+1)(sum(k=...

[" 88the value of "sum_(k=1)^(n+1)(sum_(k=1)^(n)c_(r-1))" (where "r,k,n in n)" is equal to "],[" a."2^(n+1)-2" b."2^(n+1)-1quad " c."2^(n+1)quad " d.none of these "]

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