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The addition of 4 bits two complement binary numbers $1101$ and $0100$ results in

1. 0001 and an overflow
2. 1001 and no overflow
3. 0001 and no overflow
4. 1001 and an overflow

Overflow cannot occur when number under addition are of opposite sign

Here one number is +ve and another is -ve

Now we perform 2's compliment arithmetic

1101 + 0100 == 10001 discard carry as in 2's compliment rule

by

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how do you know whether it is 1’s compliment addition or 1’s compliment addition

1
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