Q.

The output sum of two decimal digits can be represented in                          

A. gray code
B. excess-3
C. bcd
D. hexadecimal
Answer» C. bcd
Explanation: the output sum of two decimal digits can be represented in bcd(binary-coded decimal). binary-coded decimal (bcd) is a class of binary encodings of decimal numbers where each decimal digit is represented by a fixed number of bits, usually four or eight.
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