Posted by **Luke** on Wednesday, August 18, 2010 at 5:42pm.

Find (A upside down U B) upside down U C, given

A = {s,e,t}

B = {m,E}

C = {f,r,e,e,}

- math -
**Jen**, Wednesday, August 18, 2010 at 5:46pm
Ok, that's A intersection B intersection C. You have to find out what they have in common with repeating any elements. The paranthesis means to do this first. A and B have an e in common. That e is also in C, so your answer is e.

(Side note: A U B means a union b. If you were asked to find this, you bring together everything in both sets without repeating. A U B would be s, e, m, t.)

- math -
**Luke**, Wednesday, August 18, 2010 at 6:03pm
So Would it be like this?

A,B, = e

C = e

AUB = s,e,m,t

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