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  • Ten different letters of an alphabet are given. Words with five letters are formed from these given letters. The number of words which have at least one of their letter repeated is<div class='q

Ten different letters of an alphabet are given. Words with five letters are formed from these given letters. The number of words which have at least one of their letter repeated is

Option: 1

69760


Option: 2

 30240


Option: 3

 99748


Option: 4

none of these


Answers (1)

best_answer

The required number of words =10^{5}-{ }^{10} P_{5}

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Nehul

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