If a student sees a teacher in the class he would not sleep in the class, One day, a student does not see a teacher in the class. Which of the following statements is true?

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Here let X be the event that the student sees a teacher. And event Y be the event that he is sleeping. We have been given that X → ~ Y. However, we do not know anything about ~ X, and the question asks us what Y will be if ~ X.
∴ We cannot conclude anything.

If a student sees a teacher in the class he would not sleep in the class, One day, a student does not see a teacher in the class. Which of the following statements is true?

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