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Study Stuff for MCA Examinations - NIMCET
Study Stuff for MCA Examinations - NIMCET
Previous Year Question (PYQs)
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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