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Wenn P(A1)> 0, dann gilt:

P(A1 ∩ A2) = P(A1)*P(A2 | A1)

Wenn P(A1 ∩. . .∩ An−1) > 0, dann gilt:

P(A1 ∩ . . . ∩ An) =
P(A1)*P(A2 | A1)*P(A3 | A1 ∩ A2) *. . . *P(An | A1 ∩ . . . ∩ An−1)