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Word of length 10 are formed using th...

Word of length 10 are formed using the letters A,B,C,D,E,F,G,H,I,J. Let `x` be the number of such words where no letter is repeated; and let `y` be the number of such words where exactly one letter is repeated twice and no other letter is repeated. The, `y/(9x)=`

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MOTION-THEORY AND EXERCISE BOOK-EXERCISE - 4 (LEVEL -II)
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  17. Word of length 10 are formed using the letters A,B,C,D,E,F,G,H,I,J....

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