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

[" If "x+y=1" ,then "sum_(r=0)^(n)r^(n)C_(r)x^(r)y^(n-t)" equals "],[[" (a) "1," (b) "n," (c) "nx]]

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