# 2.2 Set Operations: Discrete Mathematics and its application

1. Oct 5, 2008

### modzz

page.130 Ex.20

Ex.20
Show that if A and B are sets, then (A$$\cap$$B) $$\bigcup$$ (A$$\cap$$B) = A.

how do u solve this?

3. The attempt at a solution

2. Oct 5, 2008

### Dick

You can't. It's false.

3. Oct 5, 2008

modzz:

did you possibly mis-type? Do you mean to show

$$(A \cap B) \cup (A - B) = A$$

4. Oct 14, 2008

### fdsafdsa

I'm having trouble with this question as well. The second B has a line above it if that means anything. Please help me.