Derive a truth table for a combinational logic circuit, Cost Accounting

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Derive a truth table for a combinational logic circuit that is to decode a 4-bit BCD representing a number in the range 0-9 and generate an appropriate 7-bit output to illuminate the appropriate elements of the display to represent this digit.

Hence minimise each of the 7-bit outputs, making use of don't care conditions and implement the decoder on a PLA.

State the size of PLA required.


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