Multiple choice

The sum of weights in a self complementing BCD code must be

  1. 7

  2. 9

  3. 10

  4. 8
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A self-complementing BCD code is one where the 9's complement of a decimal digit is obtained by taking the 1's complement of its binary representation. The sum of the weights in such a code must equal 9 (e.g., 2421 code: 2+4+2+1=9).

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