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UGC NET Computer Science Dec 2019 (Paper II)

Which of the following binary codes for decimal digits are self complementing?

(a) $8421$ code
(b) $2421$ code
(c) excess-$3$ code
(d) excess-$3$ gray code

Choose the correct option:

Solution

A self-complementing code is a code in which the $9$'s complement of a decimal digit is obtained by complementing all bits.

$8421$ code is not self-complementing.

$2421$ code is self-complementing.

Excess-$3$ code is also self-complementing.

So, correct codes are:

(b) and (c)

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