[" If "(1+x)^(n)=sum(r=0)^(n)^(n)C(r)x^(...

[" If "(1+x)^(n)=sum_(r=0)^(n)^(n)C_(r)x^(r)," then "],[^(n)C_(0)+(^(n)C_(1))/(2)+...(^(n)C_(n))/(n+1)" is "],[[" (a) "(2^(n)-1)/(n)," (b) "(2^(n+1)-1)/(n+1)" (c) "(2^(n)-1)/(n+1)," (d) "(2^(n)+1)/(n+1)]]

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