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For events E and F with P(F) > 0, P(E|F) is which ratio?
AP(E ∩ F) / P(E)
BP(E ∩ F) / P(F)
CP(E) / P(F)
DP(E) x P(F)
Answer & Solution
Correct answer: B. P(E ∩ F) / P(F)
Conditioning on F shrinks the sample space to F, so the favourable part is E ∩ F divided by P(F).
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