MHT CET 2024 Mathematics question
Words of length 10 are formed by using the letters A, B, C, D, E, F, G, H, I, J. Let x be number of such words where no letter is repeated and y be number of such words where exactly two letters are repeated twice and no other letter is repeated, then the value of is
Answer: (3)
Solution
With no repetition, all letters are used once: . For : choose the letters that appear twice in ways; the remaining positions are filled with different letters chosen from the other letters in ways. The word then consists of letters with two
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