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GATE ECE 2002 | Question: 2.12

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If the input $X_{3}, X_{2}, X_{1}, X_{0}$ to the ROM in the figure are $8-4-2-1$ BCD numbers, then the outputs $Y_{3} Y_{2} Y_{1} Y_{0}$ are

 

  1. gray code numbers
  2. $2-4-2-1$ BCD numbers
  3. excess-$3$ code numbers
  4. none of the above
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