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 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?

6 years ago


Answers : (1)


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


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