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they are not the same elements.
A null set is a set that does not contain any elements, an empty set.
The cardinality of a set is its size. For instance, since the set G contains 4 elements, then its cardinality is 4. So if the set has a finite number of elements (meaning it is a finite set), you can find its cardinality, otherwise you cannot (meaning it is an infinite set).
it denotes the set of ordered pairs with elements of A and b in the format (a,b)
Well if the "set" is "edible fruit", then the elements would be members of the set - "bananas, apples, grapes, oranges etc."