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If A, B and C are the inputs of a full adder then the carry is given by __________(a) A AND B OR (A OR B) AND C(b) A OR B OR (A AND B) C(c) (A AND B) OR (A AND B)C(d) A XOR B XOR (A XOR B) AND CI got this question during an online interview.The doubt is from Half Adder & Full Adder topic in portion Arithmetic Circuits of Digital Circuits

Answer»

Right choice is (a) A AND B OR (A OR B) AND C

The best explanation: If A, B and C are the inputs of a full adder then the CARRY is given by A AND B OR (A OR B) AND C, which is EQUIVALENT to (A AND B) OR (B AND C) OR (C AND A).



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