An 8x1 mux can be implemented
using two 4x1 muxes and one 2x1 mux. 4 of the inputs can first be decoded using
each 4-input mux using two least significant select lines (S0 and S1). The
output of the two 4x1 muxes can be further multiplexed with the help of MSB of
select lines at further stage. The implementation of 8x1 using 4x1 and 2x1
muxes is shown in figure 1 below:
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