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How many truth table entries are necessary for a four-input circuit?

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How many truth table entries are necessary for a four-input circuit?

(a) 4

(b) 8

(c) 12

(d) 16

I had been asked this question during an online interview.

This interesting question is from Logic Gates and Networks in chapter Boolean Algebra and Minimization Techniques and Logic Gates of Digital Circuits

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Right answer is (d) 16

To explain I would say: For 4 inputs: 2^4 = 16 truth table entries are necessary.

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