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A synchronous MOD-10 counter has how many unused states if implemented with four flip-flops?

  • A2
  • B4
  • C6
  • D10
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Correct Answer: C. 6
Explanation: Four flip-flops can represent 16 binary states. A MOD-10 sequence uses 10 of them, leaving 16−10=6 unused states.
Reference: Standard digital electronics: counter unused states
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