Deductive or inductive? Valid/invalid or strong/weak?
1. If organic food contains pesticides, then consumers are misled. Organic food does not contain pesticides. Therefore, consumers are not misled.
2. All aerobic exercises are calorie burners and all calorie burners are weight reducers. Thus, all aerobic exercises are weight reducers.
3. When Jack took his car in for service, the mechanic charged him for lots of work that didn't need to be done. The same thing happened to Niki and Claire. Apparently mechanics these days are just a bunch of crooks.
4. Graffiti painted on that vacant building says "Boycott Meat." Therefore, it's clear that we should all become vegetarians.
5. James Bloomfield, the widely respected expert on art authentication, says that the painting recently discovered in the basement of the art museum is a genuine Picasso. Therefore, we conclude that the painting is indeed a genuine Picasso.
6. Some fruit is red. All strawberries are fruit. Therefore, some strawberries are red.