Question 1
Consider "Since no judge is a garbage collector, no garbage collector is a judge." This inference, drawn by conversion, is
◦ valid
◦ not valid
◦ valid by limitation
Question 2
Consider "Since no judge is a garbage collector, some non-garbage collectors are not non-judges." This inference, drawn by contraposition, is
◦ valid
◦ not valid
◦ valid by limitation