Represent decimal 3984 in the 2421 code of Table 3-6. Complement all bits of the coded number and show that the result is the 9's complement of 3984 in the 2421 code.

Table 3-6

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Decimal BCD digit 8421 0123 4 5 6 6789 Unused bit combi- nations 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 2421 Excess-3 0000 0001 0010 0011 0100 1011 1100 1101 1110 1111 1010 1011 1100 0111 1101 1000 1110 1001 1111 1010 0101 0110 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 0000 0001 0010 1101 1110 1111 Excess-3 gray 0010 0110 0111 0101 0100 1100 1101 1111 1110 1010 0000 0001 0011 1000 1001 1011