1. ## AUB=

what does this symbol mean??? I came across a math problem that had this question....I don't remember the exact problem but it was something like this.....I don't know what this means.

A(1,3,5,7,9) B(1,3,9,12) AUB=

can you tell me how to do this and what that symbol means please

2. ## Re: AUB=

It mean "A union B" or "A or B"

What would "A or B" mean with regards to the two sets?.

It would mean the elements that are in A or B.

What is in A or B?.

1,3,5,7,9,12

Now, if the symbol were upside down and you had $A\cap B$

That means, "A and B" or "A intersect B".

What is in "A and B"?.

That is, what do they share?.

1,3,9

Those elements are in both sets. If you draw a Venn diagram, they would be in the intersection of the two circles.

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