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In 2′s complement addition,carry always doesn’t indicate overflow.
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When we will add a positive value (+a) with a negative value(-b). The result will be in between them means -b<= result <= +a. So overflow can not occur. As if we can represent -b and +a in some fixed number of bits then we can also represent any number between them.
C. In 2′s complement addition, overflow is flagged when the carries from sign bit and previous bit did not match. i.e Cn⊕Cn−1=1.
Answer: B