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Ten different letters of alphabet are given, words with 5 letters are formed from these given letters. Then, the number of words which have at least one letter repeated is:
Correct Answer is Option A):
Number of words which have at least one letter replaced,
= Total number of words - total number of words in which no letter is repeated.
=> 105 16P5.
=> 100000 − 30240 = 69760.
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