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[" 7.The value of "r" for which "^(20)C(...

[" 7.The value of "r" for which "^(20)C_(r)^(20)C_(0)+^(20)C_(r-1)^(20)C_(1)+^(20)C_(r-2)^(20)C_(2)+...+^(20)C_(0)^(20)C_(r)" is maximum is "],[[" (1) "15,(2)20,(3)11,(4)10]]

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