Question

The output sum of two decimal digits can be represented in ____________

(a) Gray Code

(b) Excess-3

(c) BCD

(d) Hexadecimal

The question was asked in quiz.

This intriguing question comes from BCD Adder in chapter Arithmetic Circuits of Digital Circuits

Answer 1

Right choice is (c) BCD

The best I can explain: 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.