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## Main Question or Discussion Point

P(B/A) = P(A/B).P(B) / P(A)

Later we expand P(A) as P(A/B).P(B) + P(A/

I don't understand how we can expand P(A) like that. Doesn't that assume that A ℂ B?

Later we expand P(A) as P(A/B).P(B) + P(A/

__B__).P(__B__) ...__B__is complement of BI don't understand how we can expand P(A) like that. Doesn't that assume that A ℂ B?