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Morris Mano

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Find the 9’s complement of decimal 6,248 and express it in 2421 code.?

Answer.  9 s complement of 6248 is 9999-6248=3751

In 2421 Code the representation of 3751 is:-0011 0111 0101 0001

Is this Correct??????????
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given that it is 2-4-2-1 code.

properties of 2-4-2-1 code is self complementary, means if you fix a representation for digit x then you have fixed the representation for 9's complement of x...

if you put 0010 for representing 2 then 7 must be represented as 1101 ( which is complement to 2 ) but not as 0111.

therefore you have to fix the representation of digits before representing the number...
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