The addition of 4-bit, two's complement, binary numbers 1101 and 0100 results in

Step 1: Interpret the numbers as 4-bit two's complement: 1101 = -3, 0100 = +4.

Step 2: Add them in decimal: -3 + 4 = +1.

Binary addition: 1101 + 0100 = 10001 (a 5-bit result). Discard the extra carry-out and take the lower 4 bits: 0001.

• Interpretation: 0001 represents +1 in 4-bit two's complement.

• Overflow rule: Overflow in two's complement occurs when adding two numbers with the same sign gives a result with a different sign. Here the operands have opposite signs, so overflow does not occur.

Answer: 0001 and no overflow.