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when we realize a 64x1 mux using 4x1 muxes we have levels?

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options are:-

A) 2

B)3

C)4

D)5

Please provide answer with explanation.
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At level 1 we need 64/4 =16  4:1 MUX   we will have 16 output at this level

At level 2 we need 16/4 = 4  4:1 MUX    we will have 4 output at this level

At level 3 we need 4/4=1      4:1 MUX     we will have 1 output at this level

So total 3 level require to realize 64x1 mux using 4x1 muxes 

 
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