The maximum positive and negative numbers which can be represented

The maximum positive and negative numbers which can be represented in 2’s complement form using n bits are respectively—

1. + (2^{n – 1} – 1), – (2^{n – 1} – 1)
2. + (2^{n – 1} – 1), – 2^{n – 1}
3. + 2^{n – 1}, – 2^{n – 1}
4. + 2^{n – 1}, – (2^{n – 1} + 1)

Maximum positive and negative numbers which can be represented in 2's complement using n bits + (2^{n – 1} – 1) and – 2^{n – 1}