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### 6 Cards in this Set

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 A set is a (...) of objects. (collection) (family) (class) Word such as (...), (...), and (...) are often used synonymously with the word set. (family) (collection) (class) If x is a member of the set S, we denote that by x  S, where "" is the notation of "(...)". (is an element of) If x is not a member of S, we denote that by (...) (x / S) We denote the set of all real numbers by (...) (R) Given two sets A and B, the collection of elements that belong to set A or set B is called the (...) (Union of A and B)