2.2 Set Operations: Discrete Mathematics and its application

[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?

The Attempt at a Solution

 

[Dick]

You can't. It's false.

 

[statdad]

modzz:

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

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

 

[fdsafdsa]

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?

The Attempt at a Solution

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