A multiplexer is a combinational circuit which receives binary inputs from one of the 2n input lines and it directs these inputs to a single output. The selection of a particular input data line to the output is decided by a set of selection inputs. A 2n-to-1 multiplexer has 2n input lines, one output line and n selection input lines whose bit combination decides that which input is directed to output. The multiplexer or MUX is also called a data selector, because it selects one of the many input data lines and steers the binary information to the output of multiplexer.

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