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Help with Stats

Fortissimo
in Homework Help

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Guys I'm doing an introduction to statistics course and I'm sort of stumped. I can manage the calculation aspect as its more straight forward but when u have to prove stuff, I'm hopeless. Any help with this please,

Prove that if event A and event B are not mutually exclusive, then P(A or B) = P(AUB) = P(A) + P(B) - P(AnB)

Would appreciate any help. Thanks.

You may want to try the Homework Help forum. Good luck. :)

That is also true if A and B are mutually exclusive.

may be you can use a simple diagram to show the relationship. I cannot provide the rigorous proof yet.

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