Words of length 10 are formed using the letters A, B, C, D, E, F, G...

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Words of length 10 are formed using the letters A, B, C, D, E, F, G, H, I, J. Let \( \mathrm{x} \) 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
\( \mathrm{P} \) repeated twice and no other letter is repeated. Then, \( \frac{\mathrm{y}}{9 \mathrm{x}}= \)

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