Ten different letters of an alphabet are given words with 5 letters formed from these given letter. Then, the number of words which have atleast one letter repeated is
a) 69760
b) 30240
c) 99748
d) None of these
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) 69760
?ⓣⓗⓘⓢ ⓘⓢ ⓐⓝⓢⓦⓔⓡ
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