Question: A gate or set of gates is universal if it can be used to construct any Boolean function. For example, the set {AND, OR, NOT}

A gate or set of gates is universal if it can be used to construct any Boolean function. For example, the set {AND, OR, NOT} is universal.
(a) Is an AND gate by itself universal? Why or why not?
(b) Is the set {OR, NOT} universal? Why or why not?
(c) Is a NAND gate by itself universal? Why or why not?

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