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Mathematics
Probability
Combined Events
Conditional Probability
Conditional Probability
What You Need to Know
Calculate probabilities of independent and dependent combined events using diagrams.
Calculate conditional probability from first principles.
Apply the formula
P
(
A
∩
B
)
=
P
(
A
∣
B
)
P
(
B
)
P(A \cap B) = P(A | B)P(B)
P
(
A
∩
B
)
=
P
(
A
∣
B
)
P
(
B
)
.
Determine independence of events using
P
(
A
∣
B
)
=
P
(
A
)
P(A | B) = P(A)
P
(
A
∣
B
)
=
P
(
A
)
.
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