A) 69760
B) 30240
C) 99748
D) None of these
Correct Answer: A
Solution :
Number of words in which all the 5 letters are repeated \[={{10}^{5}}=100000\] and the number of words in which no letter is repeated are\[^{10}{{P}_{5}}=30240\]. Hence the required number of ways are 100000 - 30240 = 69760.
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