Question 47

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, $$\frac{y}{9x} =$$

Correct Answer: 5

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