// typo in 3a, 3b, 3c. Please read n2 as n^2.

3 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? [2 points each] 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 s 9. Then ns 3 c) If n is a real number with n > 2, then n2 > 4. Suppose that n s 2. Then n2 s 4