# Thread: Independance probability question

1. ## Independance probability question

Hi

I understand that for a event to have independence it follows that
P(A and B)= P(A) x P(B)

however i cannot understand this question

I have attached the question

any help is appreichated.

2. Hi

Maybe you can use another definition:

$P(B|A)=\frac{P(B \cap A)}{P(A)}$

i) Since the result of A will affect that of B, e.g. If A is 1 or 3, P(B)=2/5, If A is 5, P(B)=3/5, hence they are dependent.