Probability Range:
0≤ P(A) ≤ 1

Rule of Addition:
P (AuB)= P(A) + P (B)- P (A ∩ B)

Disjoint Events:
P (A ∩ B)= 0

3. University of British Columbia

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Rule of Complementary Events:
P(A’) + P(A)= 1

Conditional Probability:
P (A | B)= P (A ∩ B)/ P(B)

Independent Events:
 P (A ∩ B)= P(A). P(B)

Bayes Formula:
P (A | B)= P (B | A). P(A)/ P(B)

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