P(A U B U C) = P(A) + P(B) + (C)+ - P(A intersect B) - P(B intersect C) - P (C intersect A) + P (A intersect B intersect C). I don't know how to show this...
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Originally Posted by bhuang P(A U B U C) = P(A) + P(B) + (C)+ - P(A intersect B) - P(B intersect C) - P (C intersect A) + P (A intersect B intersect C). I don't know how to show this... I assume you are familiar with the identity . Now . Expand this out again using the fact that .