Mathematics

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Rules of inference

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  • 1. Multiple Choice
    1 minute
    1 pt
    An argument is valid if and only if:
    The premises are true and the conclusion is true.
    The premises are true.
    The conclusion must be true if the premises are true.
    The conclusion is true.
  • 2. Multiple Choice
    1 minute
    1 pt

    Is this argument valid or invalid: If Ahmed goes to Paris, he will have a lot of fun. He didn't have a lot of fun. Therefore, he must not have gone to Paris.

    valid

    invalid

  • 3. Multiple Choice
    1 minute
    1 pt

    Is this argument valid or invalid: If a baby sleeps 10 hours, then he will learn to read. If he learns to read, he will become a CEO. Therefore, if a baby sleeps 10 hours, he will become a CEO.

    valid

    invalid

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