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Conditional Probability

PA=1Z PB=14 ...

Question

$P (A) = \frac{1}{Z}$
$P (B) = \frac{1}{4}$
$P (A \cap B) = \frac{1}{5}$
$P (A / B) = ?$

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Solution

$P (A / B) = \frac{P (A \cap B)}{P (B)} = \frac{1 / 5}{1 / 4} = 4 / 5$

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