Multiple choice

Which of the following is an unweighted code?

  1. 8421 code

  2. Excess 3 code

  3. 2421 code

  4. 5211 code
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B Correct answer
Explanation

Excess-3 code is unweighted because there are no fixed weights assigned to bit positions. It is derived by adding 3 (0011 in binary) to each BCD digit, but this doesn't create positional weights like 8421 or 2421 codes do.

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