Posted by K. C on Wednesday, May 25, 2011 at 8:14pm.
Find A n B if A={5, 10, 15, 20} and B={10, 2O, 25, 30}
THAT N IS AN UPSIDEDOWN U, DON'T KNOW WHAT THAT MEANS

MATH  Damon, Wednesday, May 25, 2011 at 8:23pm
http://www.solvingmathproblems.com/mathsymbolssetintersection.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 8:30pm
The "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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