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#### paulmdrdo

##### Active member

- May 13, 2013

- 386

a. prove that if $A\cap B=\emptyset$, then $(A\times C)\cap (B\times C)=\emptyset$

b. $A\cup(B\cap C)=(A\cup B)\cap (A\cup C)$

i don't have any idea how i would start proving this.

can you give me some techniques on proofs.