1
Q
P(A∪B)
A
= P(A) + P(B) - P(A⋂B)
if mutually exclusive = P(A) + P(B) as P(A⋂B) = 0
2
Q
P(A|B)
A
= P(A⋂B) / P(B)
if independent = P(A)
3
Q
P(A⋂B)
A
P(B) * P(A|B) = P(A) * P(B|A)
4
Q
modelling assumptions
A
all outcomes equally likely
probability doesnt change over time
