Homework #2 & the Quiz

In case you didn't get the handout passed out in class, here's homework #2. It's due at the beginning of class on Tuesday, September 25th. (A printable version is available here.)

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Multiple Choice. Circle all answers that are correct. There can be more than one correct answer! Some, none, or all choices may be correct!

1. If an argument is valid and at least one of its premises is false, then
a) the argument must be unsound.
b) the premises must form a consistent set.
c) the conclusion must be logically indeterminate.
d) at least one premise is false.

2. If an argument is unsound, then
a) the argument must be invalid.
b) the argument is possibly valid.
c) the conclusion must be false.
d) at least one premise must be false.

3. If an argument is sound, then
a) its premises must form a consistent set.
b) its conclusion must be true.
c) its premises, together with its conclusion, must form a consistent set.
d) it is possible for there to be a false premise.

4. If the conclusion of an argument is true, then
a) the argument must be valid.
b) if the argument is sound, then it must be valid.
c) if the argument is valid, then it must be sound.
d) The conclusion is logically indeterminate.

5. If all the premises of an argument are true and its conclusion is false, then
a) It is possible that the argument is valid.
b) The argument must be invalid.
c) The premises must form a consistent set.
d) It is possible that the argument is sound.

True or False
___6. If a set of statements contains a logically true statement, it must be consistent.

___7. If a set of statements contains a logically false statement, it must be inconsistent.

___8. If an argument is sound, then its conclusion must be logically true.

___9. If an argument is sound, then its conclusion must be true.

___10. It’s possible for all members of an inconsistent set to be true (at the same time).

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Also, a reminder that we're having our first quiz on Tuesday, September 25th. Expect it to look like the first two homework assignments, as well as the group work we've done in class.