Question

In this circuit shown the lamp will be glowing if _________

(a) P: True, Q: True, R: False

(b) P: True, Q: True, R: True

(c) P: False, Q: False, R: True

(d) None of the mentioned

I have been asked this question in an international level competition.

My question is taken from Logic Circuits in division The Foundation: Logics and Proofs of Discrete Mathematics

Answer 1

The correct choice is (c) P: False, Q: False, R: True

To explain: The circuit will be complete if R is true and Q is false or P is false.