Thread: [SOLVED] Finding P(AandB)= and P(A)=

The textbook mentions things such as "events are independent" "mutually exclusive" and "any events," which confuses me..

So I was just wondering which formula i'm supposed to use for this question, and how we come to conclude that this is the formula we use for the given situation:

Forumlas for finding P(A and B)= :
1) P(AandB)= P(A) * P(B)
2) P(AandB)= P(A) * P(B|A)

Problem:
P(A) = 0.61
P(B) = 0.39
P(A U B) = 0.75
P(AandB) = ?


and for another problem, I have to find P(A) and P(B), but i'm not sure how to find this. the only guess I can make is to work backwards, but i'm not so sure how to do that.