The union of sets A and B, that is, the set of all elements that are either in A or B (or both).
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What does length mean in math
Communitive means of, or belonging to, a community. It has no meaning in math. Communative does not mean anything - in math or elsewhere.
What does > mean?
the mean is the average
The word "mean" in math means the same thing as average. Mean is just a nickname for average.