- #1
TheMathNoob
- 189
- 4
Homework Statement
I don't undersand why Pr(A l B) = P(AnB)/P(B)
Homework Equations
conditional probability[/B]
Pr(A l B) = P(AnB)/P(B)
A given B
The Attempt at a Solution
I can make a bunch of problems with this definition intuitively, but I really want to understand with sets what is going on behind this equation. Why is that true?. The book is very vague at explaining that.[/B]