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5,5,2(2*4 decoder). using 2 2:1 mux can implement half adder
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To inpkement half adder we require 5 nand  or 5 nor gates

If we inplement half adder using mux we require 3 mux,2 for generating sum(xor) and 1 for carry

With one  2:4 decoder  we can implement half adder

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