Suppose that the premises of an argument are: "All dogs are green"
and "No green things are tall." Which of these conclusions makes
the argument valid?
O "All dogs are tall."
O "No dogs are tall."
O "Dogs are mammals."
O "All tall things are dogs."
O None of these
and "No green things are tall." Which of these conclusions makes
the argument valid?
O "All dogs are tall."
O "No dogs are tall."
O "Dogs are mammals."
O "All tall things are dogs."
O None of these