Indicate whether the following arguments are deductive or inductive.

1. No triangle is a square because all triangles have three sides and squares have four sides.

2. Since more than half of all automobile accidents involve drivers under twenty-five, it follows that drivers under twenty-five are probably a greater driving risk than those older than twenty-five.

3. Smith missed work today. He must be ill because in the past he's only missed work when he's been ill.

4. The chances of rolling a five with a die are one in six.

5. The presidential candidate that Maine selects usually indicates the one who'll be elected. So, it's safe to say, "As Maine goes, so goes the nation."

6. Every class I've taken so far has had an even male-female distribution in it. It's obvious, then, that the student population of this college is evenly divided between males and females.

7. If the president stands for re-election, he'll surely be elected. Anyone who thinks thepresident won't run again just doesn't understand politics or political ambition. So, it's clearwho the next president will be: the present incumbent.

8. Sandy was either present or she knew someone who was present. If she was present, thenshe knows more than she's admitting. If she knew someone who was present, then sheknowsmore than she's admitting. Either way, Sandy knows more than she's admitting.

9. The chances that there are atmospheric conditions similar to earth's elsewhere in the universe are very high. So, extraterrestrial life probably exists.

10. This argument is valid because its premises logically entail its conclusion, and any argumentwhose premises logically entail its conclusion is valid.