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manisha mehra Grade: 11
        

 ten different letters of an alphabet is given. words with five letters are formed from these given letters.then the number of words which have atleast one letter repeatted is69760.prove it?

7 years ago

Answers : (1)

Badiuddin askIITians.ismu Expert
147 Points
										

Dear manisha


total number of words of 5 letter from 10 different letter such that any letter can be repeated any number of time = 105


total number of words of 5 letter from 10 different letter such that no letter can be repeated  = 10 *9*8*7*6




now for atleast one letter is repeated = 105 - 10 *9*8*7*6


                                                     =69760


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Badiuddin



7 years ago
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