The least significant
bits (those on the
right) are 0 and 1,
giving a sum of 1 with
no carry.
There is no carry in
from a previous stage.
The next bits are 1 and
1 with no carry in,
giving a sum of 0 and a
carry of 1.
The most significant
bits are both 1 with a
carry in of 1.
This gives a sum of 1
and a carry of 1.
The result of adding 110
to 111 is 1101
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