Multiple choice

Amongst the following 4-bit groups, pick the one that is forbidden in 8421 BCD code:

1001, 1, 1010, 2, 0101, 0110

  1. 1001

  2. 0110

  3. 1010

  4. 2

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

1010 is a forbidden code in the above series.