I need help to solve this question of probability

Question

Two events A and B are defined on a sample space such that P(A)=0.3, P(B)=0.2, P(A intersection B)=0.1. what is the probability that exactly one of the two events occur?

Answer 1

You only want the probability of either A or B, therefore you have to subtract the probability of the intersection of these two events from the individual events.  P(A) = .3, but .1 is when it intersects P(B).

{P(A) - P (A int B)} + {P(B) - P (A int B)} = your answer

( .3 - .1 ) + ( .2 - .1 ) = .3

I

Answer 2

0.4

Answer 3

0.3(chance A happens)*0.8(chance B doesn't happen)=0.24

0.7(chance A doesn't happen*0.2(chance B does happen)=0.14

0.24+0.14=0.38

0.38 i think.

Answer 4

Is it not 0.3 x 0.2 ???

If not I don't know