Find P(notB|notA) Given P(A), P(B), P(A and B) (Venn Diagram)

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This video explains how to use a Venn diagram to determine conditional probability.
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I am studying this right now in Engineering school. Perfect timing, thanks!

danielyoungk
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I enjoyed this video! I found it when looking for the answer to this question. Might you know? The classic birthday problem shows that you find the probability of at least 2 people sharing a birthday with 23 people in a room is virtually 50%, found by subtracting the probability of no one sharing a birthday from 100%. Are there a class of problems that can ONLY be solved by finding the opposite and subtracting that from 100%? Intuition (which may be wrong) says if I can find the probability of something NOT happening, I should be able to find the probability of the opposite (that something does happen.) I know I can easily find P(A) = 100% - P(notA). But, what if I wanted to find P(A) without first finding P(notA)? Are there some problems where I cannot do that... I can ONLY find P(notA) and must do that in order to find P(A)? Just curious.

panepinto
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is it just me or is the vid not working

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