Sign-magnitude

2’s compliment

Octal number system

Decimal number system

 Hexadecimal number system

2's complement

Sign-magnitude

1’s complement

None of these choices 

With special sign bit, easy to implement in hardware

Easy to perform calculations as only 0s and 1s in the 2s compliment system 

No special sign bit, easy to implement in hardware, no -0

Sign bit will help easy to implement in hardware

Transistor count will double approx. every 18 (24) months.

Transistor count will quadruple approx. every 18 (24) months.

Transistor count will triple approx. every 18 (24) months.

Transistor count will double approx. every 24 (48) months.