9 Maths -- Set

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Do elements in a set need to be ordered?

Define sets and the ways to express set.

What is the union of sets A and B, if A = {1, 2, 3} and B = {2, 3, 4, 5}?

If set A contains 50 elements and its complement has 70 elements, what is the total number of elements in the universal set that contains both A and its complement?

If set A contains all even numbers between 1 and 10, inclusive, and set B contains all prime numbers between 1 and 10, inclusive, what is the complement of the intersection of sets A and B?

If A is a subset of a universal set U, what is the complement of A, and how is it denoted mathematically?

If A is a subset of a universal set U, what is the complement of A, and how is it denoted mathematically?

Let A = {1, 2, 3, 4} and B = {3, 4, 5, 6}. What is A-B, and what are the elements of the resulting set?

What is the definition of the cardinality of a set, and how is it denoted mathematically? Can the cardinality of an infinite set be defined, and if so, how is it determined?

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