## Homework Hints 12-3

### Note: Homework Hints are given only for the Level 1 and Level 2 problems.

However, as you go through the book be sure you look at all the examples in the text. If you need hints for the Level 3 … See the whole entry

However, as you go through the book be sure you look at all the examples in the text. If you need hints for the Level 3 … See the whole entry

- Infinite sets
- finite
- infinite
- one-to-one
- correspondence
- countable/uncountable
- rational numbers are countable
- real numbers are uncountable

- Cartesian product of sets
- definition
- cardinality of a Cartesian product
- fundamental counting principle

**One-to-one Correspondence**

Two sets *A* and *B*… See the whole entry