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Felles P. Radsum/kolonnesum=marginale.
Grunnregel: 0≤P(A)≤10 \leq P(A) \leq 10≤P(A)≤1. P(A∪B)=P(A)+P(B)−P(A∩B)P(A \cup B) = P(A) + P(B) - P(A \cap B)P(A∪B)=P(A)+P(B)−P(A∩B). Uavhengige: P(A∩B)=P(A)⋅P(B)P(A \cap B) = P(A) \cdot P(B)P(A∩B)=P(A)⋅P(B).
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