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[" 4.Let "S={1,2,3,...,9}." For "k=1,2,....

[" 4.Let "S={1,2,3,...,9}." For "k=1,2,...,5," let "N_(k)" be the "],[" number of subsets of "S" ,each containing five elements out "],[" of which exactly "k" are odd.Then "N_(1)+N_(2)+N_(3)+N_(4)+N_(5)],[[" (1) "125," (2) "252," (3) "210," (4) "126]]

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