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sum(r=1)^(5)^(5)C(r)...

sum_(r=1)^(5)^(5)C_(r)

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Evaluate the following: sum_(r=1)^(5)C_(r)

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The value of sum_(r=0)^(n)sum_(s=1)^(n)*^(n)C_(5)*^(s)C_(r) is