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[" The value "sum(r=0)^(20)r(20-r)(^(20)...

[" The value "sum_(r=0)^(20)r(20-r)(^(20)C_(r))^(2)" is equal to "],[[" (1) "400^(39)C_(20)," (2) "400^(40)C_(19)],[" (3) "400^(39)C_(19)," (4) "400^(38)C_(20)]]

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