Q. How many 4:1 Mux is needed to make 128:1 Mux.

A
23
B
43
C
13
D
42
Solution:

Divide by 4, that is 128/4 = 32
32/4 = 8
8/4 = 2
2/4=.5
Thus Number of MUX needed= 32+8+2+1=43.

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