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Digital ElectronicsMultiplexers & Demultiplexers

Using only an 8-to-1 multiplexer, how many select inputs are required to choose one of the eight data inputs?

  • A2
  • B3
  • C4
  • D8
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Correct Answer: B. 3
Explanation: Eight choices require log2(8) = 3 select bits.
Reference: Standard digital electronics: multiplexer selection
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