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Which of the following is an invalid state in an 8-4-2-1 Binary Coded Decimal counter

1. 1000
2. 1001
3. 0011
4. 1100

Correct answer: 1100

Solution

The binary coded decimal (BCD) system represents decimal digits using four bits, and valid BCD values range from 0000 (0) to 1001 (9). The binary representation 1100 corresponds to the decimal value 12, which is not a valid BCD representation.

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