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Posted by **K. C** on Wednesday, May 25, 2011 at 8:14pm.

THAT N IS AN UPSIDEDOWN U, DON'T KNOW WHAT THAT MEANS

- MATH -
**Damon**, Wednesday, May 25, 2011 at 8:23pmhttp://www.solving-math-problems.com/math-symbols-set-intersection.html

It means intersection

which elements are in both sets? (overlap)

5 no

10 yes

15 no

20 yes

25 no

30 no

so

{ 10,20}

- MATH -
**Reiny**, Wednesday, May 25, 2011 at 8:30pmThe "upside down U" stands for intersection.

It means that you are looking for all elements which are common to both A and B

A ∩ B = {10,20)

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