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It is said that any boolean function of n variables can be implemented using a mux of n-1 selector lines.so how can we represent a function f(A,B,X)=ABX'+ABX on a 4:1 mux?

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This is a 3 variable function.

So it can be implemented by selecting any two variables as selector lines.

Here i have choosen B and X as the selector lines.

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