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How many $\text{4-to-1}$ multiplexers are needed to implement a $\text{64-to-1}$ multiplexer?
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All India Mock Test 3 - Solutions Part 2

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64/4 = 16 in first level

16/4 = 4 in second level

4/4 = 1 in third level

Hence, we need 16 + 4 + 1 = 21 Multiplexers to implement 64: 1 Mux