Computer Sciences > Gate 2017 Set-1 > Complements
When two 8-bit numbers A7 ... A0 and B7 ... B0 in 2^^s complement representation (with A0 and B0 as the least significant bits) are added using ripple-carry adder. the sum bits obtained are S7 ... S0 and the carry bits are C7 ... C0. An overflow is said to have occurred if
A
the carry bit C7 is 1
B
all the carry bits (C7, ... , C0 ) are 1
C
(A7 . B7 . S7' + A7' . B7' . S7) is 1
D
(A0 . B0 . S0' + A0' . B0' . S0) is 1

Correct : Complements

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