Posted by **Jen** on Wednesday, July 27, 2011 at 12:34pm.

Consider the Venn diagram below. The numbers in the regions of the circle indicate the number of items that belong to that region.

(2 intersecting circles A & B, where A part is 50, B part is 110, and the intersecting part is 40)

Determine:

n(A)

n(B)

P(A)

P(B)

P(A|B)

P(B|A)

How in the world do i input this in my calculator?? I have no idea how to do this....

- Venn Diagrams :( -
**MathMate**, Friday, July 29, 2011 at 6:46pm
If your A does not include the intersection of A and B, then

n(A)=number of items belonging to A

A part + intersection of A & B

n(B)=B part + intersection of A & B

Total of A & B (assumed = universe)

n(U)=A part + B part + intersection

P(A)=probability of picking an item from A

=n(A)/n(U)

P(B)=n(B)/n(U)

P(A∩B)=n(A∩B)/n(U)

P(A|B)=probability of A given B

=P(A∩B)/P(B)

P(B|A)=P(B∩A)/P(A)

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