ten different letters of alphabet are chosen. then....

karan

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Jan 10, 2008
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Ten different letters of alphabet are given. Words with five letters are formed from these then, what will be the the number of words that can be formed that have at least one letter repeated.
 
karan said:
Ten different letters of alphabet are given. Words with five letters are formed from these then, what will be the the number of words that can be formed that have at least one letter repeated.

Where are you stuck?
 
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