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A full – adder can be implemented with half – adders and OR gates. A 4 – bit parallel full adder without any initial carry requires

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A full – adder can be implemented with half – adders and OR gates. A 4 – bit parallel full adder without any initial carry requires
  • A8 half – adders, 5 – OR gates
  • B8 half – adders, 4 – OR gates
  • C7 half – adders, 4 – OR gates
  • D7 half – adders, 3 – OR gates
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A full adder can be implemented with 2 half adders and one OR gate.

A 4-bit parallel adder can be implemented using 3 full adders and one half adder.

Hence we require 7 half adders and 3 OR gates to implement 4-bit parallel adder.