CountingPrinciples

# CountingPrinciples - Some Basic Probability Notation and...

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Some Basic Probability Notation and Terminology Let A and B be two sets. 1. Suppose every element of a set A also belongs to set B, then A is called a subset of B, or A is said to be contained in B, which is written as A B or B A 2. Two sets are equal if they both have the same elements or, equivalently, if each is contained in the other. A = B if and only if A B and B A 3. The statement that an element a belongs to a set S is written a S Here is the symbol meaning “is an element of “. 4. The negation of a S, A B and A = B are written a S, A B and A B 5. If A B and A B, then we say that A is a proper set of A, also written A B.

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6. A set with no elements is called the empty set or null set , and is denoted by 7. The Universal set , U, is the set of all things to be considered in this case. 8. The complement of a set A, denoted by A° or A’ or A c is the set of elements that belongs to U but which do not belong to A. 9. The
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CountingPrinciples - Some Basic Probability Notation and...

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