Hi,

I'm positing several questions(4) in one thread so that you can see the different types of problems I have to figure out, but I have to find the indicated probability, my teacher had me do it by writing an equation starting with x=, but if there's an easier method to doing this, I'd appreciate if someone would explain that. This is really confusing to me. You don't have to do all of the problems, but could someone do one problem, and explain it at least?

Problem I:

P(A)=0.6

P(B)=0.35

P(A or B)=? Otherwise known as x.

P(A and B)=0.2

Problem II:

P(A)=?

P(B)=0.44

P(A or B)=0.56

P(A and B=-0.12

Problem III:

P(A)=0.75

P(B)=?

P(A or B)=0.83

P(A and B)=0.25

Problem IV:

P(A)=8%

P(B)=33%

P(A or B)=41%

P(A and B)=?

Thank you

Isabel