P, Q, R and S are four statements. Relation between these statements is as follows.
I. If P is true, then Q must be true. II. If Q is true, then R must be true. III. If S is true, then either Q is false or R is false.
Which of the following must be true?
Explanation:
If P is true, then both Q and R have to be true. For S to be true, either Q or R must be false. Hence, if P is true, S cannot be true.
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