Conditional Probability

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The conditional probability P(A|B) is defined as

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1. **Definition**: Conditional probability is the probability of an event $A$ occurring, given that another event $B$ has already occurred.
2. **Standard Formula**: $P(A|B) = \frac{P(A \cap B)}{P(B)}$.
3. **Constraint**: This formula is valid only if $P(B) > 0$. If $P(B) = 0$, $P(A|B)$ is undefined.

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Conditional Probability

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