Question

The set b is a subset of a if are also elements in set b also elements of a.i
symbol, b a. we can also say that set a cointains the elemebts in a set b or a

Answer 1

In mathematics, the cardinality of a set is a measure of the "number of elements" of the set. For example, the set contains 3 elements, and therefore has a cardinality of 3.

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