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[" -Words of length "10" are formed usin...

[" -Words of length "10" are formed using the letters "A,B,C,D,E,F,G,H,I,J." Let "x" be the nurn "],[" of such words where no letter is repeated; and let "y" be the number of such words where exs "],[" one letter is repeated twice and no other letter is repeated.Then "(y)/(9x)=]

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