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4. Assume that the exclusive-OR gate has a propagation delay of 15ns and that the AND and OR gates have a propagation delay of 10

4. Assume that the exclusive-OR gate has a propagation delay of 15ns and that the AND and OR gates have a propagation delay of 10 ns. (a) What is the propagation delay time of following 1-bit full adder? (b) What is the total propagation delay time of a 4-bit ripple carry adder built using the 1-bit full adder? (c) What is the total propagation delay time of a 4 bit carry lookahead adder?

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CIN OUT 1-bit adder

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