1. ## Probablity Problem

If E is independent of F , F is independent of G and further E is independent of FG, then prove or disprove G is independent of EF?

2. ## Re: Probablity Problem

Hey vmd.

Hint: Use P(A and B) = P(A)P(B) and consider a case where A (in this example) corresponds to two events like P(A) = P(C and D) = P(C)P(D)

3. ## Re: Probablity Problem

Can you be more specific because I didnt understand what you are trying to say.

4. ## Re: Probablity Problem

If G is independent to EF then P(G and EF) = P(G)P(EF).

5. ## Re: Probablity Problem

Thats true,but how could i prove that ???

6. ## Re: Probablity Problem

Thats the definition of independent: If two events A and B are independent then P(A and B) = P(A)P(B).

You can think of this as P(A|B) = P(A) where B doesn't affect the outcome of A at all (i.e. they really are independent) and the definition of P(A|B) = P(A and B)/P(B) = P(A) which means that P(A and B) = P(A)*P(B). That's the intuitive reason why you have independence in mathematical form.