A) 69760
B) 30240
C) 99784
D) None of these
Correct Answer: A
Solution :
[a] Total number of words that can be formed \[={{10}^{5}}.\] Number of words in which no letter is repeated \[{{=}^{10}}{{P}_{5}}.\]So, number of words in which at least one letter is repeated \[={{10}^{5}}{{-}^{10}}{{P}_{5}}=69760.\]You need to login to perform this action.
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