Find the sum and product of each of these pairs of num- bers. express your answers as a base 3 expansion.
a.(112) 3 , (210) 3
b.(2112) 3 , (12021) 3
c.(20001) 3 , (1111) 3
d.(120021) 3 , (2002) 3
Adding in base 3 is very much like adding in base 10, but instead of carrying digits when their sum exceeds 9, we have to watch for when the sum exceeds 2:
