Question

For any integers a and 3 there exists unique integers q and r such rhat a=3q +r find the possible value of r

Answer 1

a=bq+r
b=3
r<3
r=0,1,2
because if it is equal or more than 3 that it can be counted to a multiple of 3.

Answer 2

r=0,1,3
hope it helps