Question: If there are 4 inputs to a combinational circuit which produces a 1 at the output for the following values: 3 , 6 , 9

If there are 4 inputs to a combinational circuit which produces a 1 at the output for the following values: 3,6,9,12,13,14,15 write the simplified Boolean equation using a K-map. (You don't need to start with a truth table since we know which values yield a 1 at the output).[2 pts]
What kind of a combinational circuit is needed for subtraction? Explain how this can be done. [2 pts]
If there are 4 inputs to a combinational circuit

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