Sorry to be a burden but my maths exam is tomorrow and I have no idea how to do this at all. Here is the exact question :
The two independent events $A$ and $B$ are such that $P(A) = 0.2$, $P(A\cup B) = 0.4 $.
- a. Evaluate $P(B)$.
- b. Find the probability that at least one of the two events occurs.
- c. Given that exactly one of the events occurs, find the probability that $A$ occurs.
I need help with the entire question really, but at least part a.
Thanks in advance!