A set is a collection of distinct objects. Each objectin a set is called an element or member of the set. You can use set notation to write a set by enclosing the elements of the sets in braces. For example, if A is the set of whole numbers less than 6, then A = {0,1,2,3,4,5}.
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Functions are our way of expressing a relation between two sets, which is of fundamental importance to all of math. In fact, one could argue that there would be no math, only numbers, if there weren't any relations between the numbers.
there are 5 diffeerent sets Natural Numbers whole numbers integers rational numbers irrational numbers.
the answer is -1
sets
A null set. Although they could be sets of letters, sets of people, sets of animals, in fact sets of anything other than numbers.