What is the range of the hexadecimal number system?

A digital circuit is typically constructed from small electronic circuits called logic gates that can be used to create combinational logic. Each logic gate is designed to perform a function of boolean logic when acting on logic signals.
Examples: Multiplexers, De-multiplexers, Encoders, Decoders, Full and Half Adders etc.
Types of digital logic circuits: Combinational logic circuits and sequential logic circuits. These are the basic circuits used in most of the digital electronic devices like computers, calculators, mobile phones.