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(a) translate the argument into symbolic form and (b) determine if the argument is valid or invalid. You may compare the argument to a standard form or use a truth table.

If Nicholas Thompson teaches this course, then I will get a passing grade.
I did not get a passing grade.
∴ Nicholas Thompson did not teach the course.

  • Math-geometry -

    Assume that p = Nicholas Thompson teaches this course. Assume q = I will get a passing grade. 
    The symbolic form is ~q->~p

    The truth table is:

    p.       ~p        q.       ~q.       ~q->~p

    T.        F        T.        F.               T
    T.        F        F.        T.               F
    F.        T        T.        F.               T
    F.        T        F.        T.               T

    So the conclusion is valid.

  • Math-geometry -

    f t t f f

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