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[" 18.If "sum(r=0)^(25)(^(50)C(r)*^(50-r...

[" 18.If "sum_(r=0)^(25)(^(50)C_(r)*^(50-r)C_(25-r))=k(^(50)C_(25))" ,then "k" is equal to "],[[" (1) "2^(25)-1," (2) "(25)^(2)," (3) "2^(25)]]

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