Determine whether each of these arguments is valid. If an argument is correct, what rule of inference is being used? If it is not, what logical error occurs?
a) If n is a real number such that n > 1. then n2 > 1. Suppose that n2 > 1 Then n > 1.
b) If n is a real number with n > 3. then n2 > 9. Suppose that n2 ≤ 9. Then n ≤ 3.
c) If n is a real number with n > 2, then n2 > 4. Suppose that n ≤ 2. Then n2 ≤ 4.
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