Same things happens to other bits until the MSB is reached. Hence, in order to add the next bits, we need to add three bits with carry from previous addition. Here, the sum under of the LSB is recorded and the carry is forwarded to the next bits. consider the addition of least significant bit (LSB) of two numbers. Full adder is mainly needed to add large number of bits. Full adder is used to add three bits and produce a SUM and a CARRY outputs.
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