Question

For each of the following arguments, find another argument with the same basic form in which the premise or premises are clearly true and the conclusion is clearly false. 1. If tea is dangerous, so is coffee. Tea isn't dangerous. So coffee isn't either. 2. If it were about to rain, it would be cloudy. It is cloudy. So it's about to rain. 3. Fred had either ice cream or cake for dessert. He had cake. So he must not have had ice cream. 4. You cannot pass laws against dangerous drugs, because there is no way to draw a sharp line between dangerous and nondangerous drugs. 5. If you have never written a novel, then you are in no position to make judgments about novels. So don't presume to criticize mine. 6. Since I have written several novels, I am in a position to know which novels are good. So you ought to trust me when I say that this one is great. 7. There's nothing wrong with smoking, since the longer you smoke, the longer you live. 8. If one has nothing to hide, one should not be afraid of being investigated. So no one should object to being investigated. 9. Radicals should not be granted freedom of speech, because they deny this freedom to others. 10. In nature, a species is more likely to survive when its weak members die out, so we should let the weak in our society die out.

   For each of the following arguments, find another argument with the same basic form in which the premise or premises are clearly true and the conclusion is clearly false.
1. If tea is dangerous, so is coffee. Tea isn't dangerous. So coffee isn't either.
2. If it were about to rain, it would be cloudy. It is cloudy. So it's about to rain.
3. Fred had either ice cream or cake for dessert. He had cake. So he must not have had ice cream.
4. You cannot pass laws against dangerous drugs, because there is no way to draw a sharp line between dangerous and nondangerous drugs.
5. If you have never written a novel, then you are in no position to make judgments about novels. So don't presume to criticize mine.
6. Since I have written several novels, I am in a position to know which novels are good. So you ought to trust me when I say that this one is great.
7. There's nothing wrong with smoking, since the longer you smoke, the longer you live.
8. If one has nothing to hide, one should not be afraid of being investigated. So no one should object to being investigated.
9. Radicals should not be granted freedom of speech, because they deny this freedom to others.
10. In nature, a species is more likely to survive when its weak members die out, so we should let the weak in our society die out.
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Cengage Advantage Books: Understanding Arguments: An Introduction to Informal Logic
Cengage Advantage Books: Understanding Arguments: An Introduction to Informal Logic
Walter… 9th Edition
Chapter 17, Problem 7 ↓

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If cats are mammals, so are dogs. Cats aren't mammals. So dogs aren't either. (Cats are indeed mammals, so the premise is false, and dogs are also mammals, so the conclusion is false.)  Show more…

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For each of the following arguments, find another argument with the same basic form in which the premise or premises are clearly true and the conclusion is clearly false. 1. If tea is dangerous, so is coffee. Tea isn't dangerous. So coffee isn't either. 2. If it were about to rain, it would be cloudy. It is cloudy. So it's about to rain. 3. Fred had either ice cream or cake for dessert. He had cake. So he must not have had ice cream. 4. You cannot pass laws against dangerous drugs, because there is no way to draw a sharp line between dangerous and nondangerous drugs. 5. If you have never written a novel, then you are in no position to make judgments about novels. So don't presume to criticize mine. 6. Since I have written several novels, I am in a position to know which novels are good. So you ought to trust me when I say that this one is great. 7. There's nothing wrong with smoking, since the longer you smoke, the longer you live. 8. If one has nothing to hide, one should not be afraid of being investigated. So no one should object to being investigated. 9. Radicals should not be granted freedom of speech, because they deny this freedom to others. 10. In nature, a species is more likely to survive when its weak members die out, so we should let the weak in our society die out.
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