A logic circuit which is used to change a BCD number into an equivalent decimal number is A. decoder B. encoder C. multiplexer D. code converter E. None of the above

The correct answer is: A. decoder

A decoder is a logic circuit that converts a binary code into a decimal number. It has n inputs and 10 outputs, where n is the number of bits in the binary code. The output of the decoder is a 1 if the binary code represents the decimal number 0 through 9.

A encoder is a logic circuit that converts a decimal number into a binary code. It has 10 inputs and n outputs, where n is the number of bits in the binary code. The output of the encoder

A multiplexer is a logic circuit that selects one of several input signals and routes it to an output. It has n input signals, m select lines, and one output signal. The output signal is the input signal that is selected by the select lines.

A code converter is a logic circuit that converts one code to another code. It has two input

In conclusion, a logic circuit which is used to change a BCD number into an equivalent decimal number is a decoder.