How many 4 digits number formed of only odd digits are divisible by five
How many 4 digits number formed of only odd digits are divisible by five
How many 4 digits number formed of only odd digits are divisible by five
The same answer to how many 3 digit numbers consist of only odd digits.
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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