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A multiplexer (mux) is a "many" to "few" device. For example, a 4:1 mux selects one of four input signals to be passed to the output. On the other hand, a decodertakes "few" signals and outputs "many". Typically adecoder is described as n:2^n.

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Mux is a selection circuit.there will be a series of I/p and only one o/p.the o/p will be one of the I/ p according to the logic state.demux is one I/p many o/p. Decoder s a demux with enable.logic 1 enable logic 1 o/p.

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