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Assuming repetition is allowed and 0 is not used because it is not an odd digit. There are 5 odd digits: 1,3,5,7,9 Then, there are 5 choices for the first digit, 5 for the second, 5 for the third. But, for a number to be divisible by 5 it must end in 0 or 5. Since 0 is not an odd digit, we use the 5 and there is one choice. 5*5*5*1 |
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