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Discrete Mathematics

GATE CSE 2012 · Q1

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Consider the following logical inferences. I1\text{I}_1: If it rains then the cricket match will not be played. The cricket match was played. Inference\textbf{Inference}: There was no rain. I2\text{I}_2: If it rains then the cricket match will not be played. It did not rain. Inference\textbf{Inference}: The cricket match was played. Which of the following is TRUE\textbf{TRUE}?

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Official answer: B) I1 is correct but I2 is not a correct inference

Discrete Mathematics

Let pp denote "It rains" and qq denote "The cricket match is played". The conditional statement is: "If it rains, then the cricket match will not be played", which translates to p→egqp \to eg q.

  1. For Inference I1\text{I}_1:

    • Premise 1: $p \to

eg q−Premise2: - Premise 2: q(Thecricketmatchwasplayed)−Inference: (The cricket match was played) - Inference: eg p$ (There was no rain)

By *Modus Tollens*, from p→egqp \to eg q and the negation of the consequent $eg(eg q) \equiv q,wecanvalidlyinferthenegationoftheantecedent, we can validly infer the negation of the antecedent eg p.Thus,. Thus, I\text{I}_1$ is a valid/correct inference.

  1. For Inference I2\text{I}_2:

    • Premise 1: $p \to

eg q−Premise2: - Premise 2: eg p(Itdidnotrain)−Inference: (It did not rain) - Inference: q$ (The cricket match was played)

Inferring qq from egp eg p is the fallacy of *Denying the Antecedent*. If it did not rain, the cricket match might or might not be played for other reasons. Thus, I2\text{I}_2 is not a correct inference.

Therefore, I1\text{I}_1 is correct but I2\text{I}_2 is not a correct inference, which corresponds to option (B).

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This Discrete Mathematics previous year question is Q1 of the GATE CSE 2012 paper. Find more GATE CSE PYQs on Discrete Mathematics in Engineering Mathematics, or browse all GATE CSE PYQs.

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Discrete Mathematics in GATE CSE

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GateAI solution cardGATE CSE 2012 · Q1 · MCQ

Consider the following logical inferences. I1: If it rains then the cricket match will not be played. The cricket match was played. Inference: There was no rain. I2: If it rains then the cricket match will not be played. It did not rain. Inference: The cricket match was played. Which of the following is TRUE?

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Independent practice explanation verified by the GateAI team. GATE is conducted by the IITs; question text follows the official paper.