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Ten different letters of an alphabet are...

Ten different letters of an alphabet are given. Words with five letters are formed from these given letters. Determine the number4 of words which have at least one letter repeated.

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Number of words in which all the `5` letters are repeated
=`10^5`=100000
and the number of words in which no letter is repeated are `10_(P_5)`=`30240`.
Hence the required number of ways are `100000 - 30240 = 69760.`
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