Compute 12121_3 + 1222_3 in base 3.

Answer 1

To add 12121 base 3 and 1222 base 3, we can first align the numbers by placing them one on top of the other:

1 2 1 2 1
1 2 2 2

Next, we will perform the addition starting from the rightmost digit:

1+2 = 2
2+2 = 11 (carry over 1)
1+2+1 = 11 (carry over 1)
1+1 = 2
1

Therefore, the result of 12121 base 3 + 1222 base 3 is 20102 in base 3.