A) 99748
B) 98748
C) 96747
D) 97147
Correct Answer: A
Solution :
Number of words of 5 letters in which letters have been repeated any times =\[{{10}^{5}}\] But number of words on taking 5 different letters out of \[10={{\,}^{10}}{{C}_{5}}=252\] \ Required number of words =\[{{10}^{5}}-252=99748\].
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