The digit at unit's place of odd number should be 1 to be divisible by 5 and have remainder 1.
Odd numbers are the numbers that cannot be divided into two equal parts.
In odd numbers the digits in the units place always remains 1,3,5,7 and 9.
According to the question the odd number is divided by 5 and the remainder is 1.
For the number to be divisible by 5 and have remainder 1 the digit that must be in the unit place will be 1
If we see all the digits in units place of odd numbers then 1 is the only possibility as if it is 3 then the remainder will be 3. If it is 5 then the remainder will be 0, if it is 7 then the remainder will be 2 and if it is 9 then the remainder will be 4.
Hence the digit at unit's place of odd number should be 1.
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