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sum(=1)^(n)(sum(p=0)^(r-1)^(n)C(r)^(r)C(...

sum_(=1)^(n)(sum_(p=0)^(r-1)^(n)C_(r)^(r)C_(p)2^(p))" is equal to "

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sum_(r=1)^(n)(sum_(p=0)^(r-1)""^(n)C_(r)""^(r)C_(p)2^(p)) is equal to:

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sum_(r=1)^(n) {sum_(r1=0)^(r-1) ""^(n)C_(r) ""^(r)C_(r_(1)) 2^(r1)} is equal to