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Please provide, how to make the truth table of such type of questions

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BCD code is from 0-9, so in the code conversion table, numbers from 0-9 are represented. Rest are don't care conditions 

Now that there 4 inputs and 16 outputs, hence we represent it using a 4 χ 16 decoder . The minterms corresponding to D1,D2,D3,D4 are ORed to obtain the circuit 

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