The following argument is valid: "If the moon is made of cheese,then we can eat the moon.We cannot eat the moon.Therefore,the moon is not made of cheese."

Question

Quizplus · Accepted Answer

This form of argument is known as modus tollens and is valid. One way to see the validity of this argument form is to substitute in very familiar claims. Suppose there was a rule in a bar that is perfectly enforced: "If you are drinking, then you are at least twenty-one years old." If you find someone in this bar that is under twenty-one years old, then from that fact alone you can conclude that that person is not drinking.

The Following Argument Is Valid: "If the Moon Is Made