Question

write the words using symbols the element x belongs to
​

Answer 1

The number of elements in a particular set is a property known as cardinality; informally, this is the size of a set.[6] In the above examples, the cardinality of the set A is 4, while the cardinality of set B and set C are both 3. An infinite set is a set with an infinite number of elements, while a finite set is a set with a finite number of elements. The above examples are examples of finite sets. An example of an infinite set is the set of positive integers {1, 2, 3, 4, ...}.