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If it is given that switch R is closed and Q is closed then lamp will glow if _________

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If it is given that switch R is closed and Q is closed then lamp will glow if _________

(a) P: Open, S: Closed

(b) P: Open, S: Open

(c) P: Closed, S: Closed

(d) None of the mentioned

I had been asked this question during an interview for a job.

This is a very interesting question from Logic Circuits in division The Foundation: Logics and Proofs of Discrete Mathematics

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The correct answer is (a) P: Open, S: Closed

Easy explanation: The circuit will be complete if (~P) is true and S is true.

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