They are sets of objects.
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A combination, of k objects from n.
Combination
associative
The commutative property holds that the results are the same no matter the order. Multiplication is commutative since a x b = b x a. The associative property holds that the results are the same no matter the grouping as long as the order stays the same. Multiplication is associative since (a x b) x c = a x (b x c)
Grouping symbols are parentheses such as {}, (), []. They need to be evaluated before other operations. If there are a number of nested parentheses, they must be evaluated starting with the innermost.