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Words 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. Then, y9x=___


Solution

x=10!y=10C1×9C8×10!2!=10×9×10!2y9x=102=5

Mathematics

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