GATE Computer Science (CS) 2017 Shift 1 Solved Paper

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 a 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