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Ten different letters of alphabet are given.  Words with four
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Ten different letters of alphabet are given.  Words with four letters are formed from these letters, then the number of words which have at least  one letter repeated is - 

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Ten different letters of alphabet are given.  Words with four letters are formed from these letters, then the number of words which have at least  one letter repeated is - 

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Text SolutionText solutionverified iconVerified

We have to form words with 4 letters from 10 letters.
Given, repetition is allowed. 
So, total number of words =
Number of words without repetition
Number of word with at least one letter repeated
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Question Text
Ten different letters of alphabet are given.  Words with four letters are formed from these letters, then the number of words which have at least  one letter repeated is - 

Answer TypeText solution:1
Upvotes150