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A n variable function can be realized with _______ select line multiplexer

(A) n

(B) n-1

(C) both

(D) none of these

2 Answers

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Number of select lines for  n i/p mux is Log(n)base2
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option (c) is correct

let n=3 (A,B,C)  and number of selector lines =3(i.e A,B,C) then number of input lines will be 8 .by putting $I_{0},I_{1},I_{2},I_{3},I_{4},I_{5},I_{6},I_{7}$=1  or 0 we can easily implement by 3 selector line.

Now ,let number of selector line =2(i.e A,B) and input be C then we can also implement it. correct me if i am wrong.