Given n(E) = 30, n(F) = 25, n(E-int-F) = 6: Find P(E/F).

[Navyguy]

For two sets E and F, suppose that n(E) = 30, n(F) = 25, and n(E intersection F) = 6. Find P(E/F).

My answer is 6/30. Is this right? Thank you for your help.

 

[stapel]

I know that "P(E)" means "the probability of event E", but what is the meaning of the "n(E)" notation?

When you reply, please include your work and reasoning. Thank you.

Eliz.