Multiple choice

In BCD adder, to get the correct BCD sum

  1. binary 6 (0110) is added

  2. binary 9 (1001) is added

  3. no number is added

  4. bianry 1 (001) is added

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A Correct answer
Explanation

In BCD addition, when the binary sum exceeds 9 or produces a carry, adding binary 6 (0110) corrects it to valid BCD. This adjustment accounts for the 6 invalid BCD states (10-15) that are valid in binary but not in BCD representation.