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" the sum "sum(i=0)^(r)^(n(1))C((r-i))^(...

" the sum "sum_(i=0)^(r)^(n_(1))C_((r-i))^(n_(2))C_(i)

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Find the sum_(r =0)^(r) ""^(n_(1))C_((r-i))""^(n_(2))C_(i) .

Find the sum_(r =0)^(r) ""^(n_(1))C_((r-i))""^(n_(2))C_(i) .

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