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I see terms of the form $P(A|B,C)$ a fair bit. Which of the following is true?

  1. $P(A|B,C)$ is the joint probability of $A|B$ and $C$

  2. $P(A|B,C)$ is the probability of $A$ given both $B$ and $C$

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    The first reading you mean? Yes, I see - thanks.2012-11-27

1 Answers 1

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It is the second. ${}{}{}{}{}{}$

$\Pr(A|B,C)$ is an abbreviation for $\Pr(A|(B\cap C))$.