Solution:
Here,
remainder obtained by dividing by 10
remainder obtained by dividing by 10
remainder obtained by dividing by 10
Therefore, the composition table is as follows:
It is observed from the table that elements of first row is same as the top-most row.
Therefore, is the identity element with respect to
We now have to find the inverse of 3
As a result, the inverse of 3 is 7 .