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serial adder:

1) Slower

2) It uses shift registers

3) IT requires one full adder circuit.

4) It is sequential circuit.

5) Time required for addition depends on number of bits.

Parallel adder:

1) Faster

2) It uses registers with parallel load capacity

3) No. of full adder circuit is equal to no. of bits in binary adder.

4)It is a combinational circuit

5)Time required does not depend on the number of bits

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