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The full adder is made
with two half adders.
A CARRY OUT from a
previous addition can be
added to the bits A and
B by means of the CARRY
IN.
Draw a truth table, with
A, B and CARRY IN as
inputs, and SUM and
CARRY OUT as outputs.
There is a more detailed
description of operation
on the page A 3 BIT
ADDER.
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