|1. A set "A" is a subset of B, if and only if every element of A is also an element of B, and is denoted by A Ì B.|
2. Every set is a subset of itself.
3. Y Ì X and Y¹ X, then Y is called the proper subset of X.
4. A is not a subset of B if A contains at least one element which is not in B.
5. The empty set is a subset of every set.
Directions: Check the given statements true or false. Also write at least ten examples of your own.