Problem 6 (3 x 2 6 points). Decide if the following arguments are valid. Briefly justify (a) pVq rt Therefore, p -t Rainy days make gardens grow. Gardens don't grow if it is not hot. It always rains on a day that is not hot. Therefore, if it is not hot, then it is hot. Some math majors left the campus for the weekend All seniors left the campus for the weekend Therefore, some seniors are math majors. (b) (c)