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friends..how could you make a full adder using two half adders....pls show me how would you do that with boolean expressions.......i.e...taking a full adder logical expression and then simplifying it to get two half adders......pls ..............urgent
hi murali
the logical expression of half adder is A and B are inputs
S = A XOR B C = A . B S is SUM C is carry over BOTH ARE OUTPUT
the logical expression of full adder is
A , B,C are inputs
S = A XOR B XOR C C = ( A XOR B ) . C + A . B ARE THE OUPUT
so very clearly we can use half adder S output and another input C to get S = A XOR B XOR C
and we have to use one OR gate also for C in full adder
so clearly we get XOR gate and AND gate from half adder which we can use to make FULL ADDER
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