sally was assigned to create a venn diagram to represent p(a or b). sally first writes p (a or b) = p (a) + p (b) - p (a and b) what does this mean? Explain each part of the expression.

Answer 1

I just googled "Venn Diagrams" and got hundred of pages.
Here is one of them:
https://www.youtube.com/watch?v=MassxXy8iko