Computer Science for IGCSE & O level - Data Representation (Section 16 - No. 27)

What is the fundamental principle that allows subtraction to be performed using addition in two's complement?

Inverting the bits and adding 1.

Using a separate sign bit.

Adding the positive and negative versions.

Ignoring the most significant bit.

The key is inverting the bits and adding 1 to perform subtraction via addition.