Exercise 5.1

Refer back to the post 5.1: More on Validity as often as you need to help you complete the exercise. When you have completed all six questions, check your answers here.

Say which of the following are valid arguments. In each case, state which inference rule supports your answer:

1. Some of the victims of Hurricane Katrina were arrested for looting. Therefore, none of the victims of Hurricane Katrina were innocent.
Valid / Invalid. _________________________________(From IR___).

2. All the bombers of the London Underground were Muslims. Therefore, at least one Muslim was responsible for bombing the London Underground.
Valid / Invalid __________________________________(From IR___).

3. None of George Bush’s predictions about the Iraq were accurate. Therefore, nothing in Iraq turned out the way Bush said it would.
Valid / Invalid __________________________________(From IR___).

4. Alchemists in the 17th century were unable to turn base metal into gold. Therefore, no alchemist will ever be able to turn base metal into gold.
Valid / Invalid __________________________________(From IR___).

5. All Italians are stylish people. Therefore, all stylish people are Italians.
Valid / Invalid __________________________________(From IR___).

6. No religion is merely superstition. Therefore, no mere superstition is religion.
Valid / Invalid __________________________________(From IR___).

Check the answers or continue reading

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