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?(Headbang)

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- Oct 28th 2012, 09:14 PMvmdProbablity 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?(Headbang)

- Oct 28th 2012, 09:29 PMchiroRe: 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) - Oct 28th 2012, 09:31 PMvmdRe: Probablity Problem
Can you be more specific because I didnt understand what you are trying to say.

- Oct 28th 2012, 09:32 PMchiroRe: Probablity Problem
If G is independent to EF then P(G and EF) = P(G)P(EF).

- Oct 28th 2012, 09:37 PMvmdRe: Probablity Problem
Thats true,but how could i prove that ???

- Oct 28th 2012, 09:45 PMchiroRe: 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.