Each bit represents a weight (4, 3, 2, 1 respectively from left to right). For example, the decimal number 5 is represented as 0101 in 4-3-2-1 BCD (0*4 + 1*3 + 0*2 + 1*1 = 5).
Step 2: Identify Invalid Codes
In the 4-3-2-1 BCD system, only the combinations
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