Show that if A B, then P(A|B) = P(A)/P(B). Find P(A|B) for A B, and

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Show that if A ⊆ B, then P(A|B) = P(A)/P(B). Find P(A|B) for A ⊇ B, and for disjoint A and B. Explain why the last two answers are obvious.

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