Parity Addition. Example 1.
Problem: 01 11 = ?.
Answer: 01 11 = 10.
Remember that parity addition does not have a carry! If we take the first column from the right, we get in parity addition:
The rightmost digit of our answer is therefore 0. Second column from the right: 0 1 = 1.
So our answer is: 1 0!
(Note that since there are no carries here, we don't have to start from the right: we can do the parity addition in every column separately, without worrying about carries from other columns.)