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add independent event and rule

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eggy 2021-03-25 09:56:26 -04:00
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docs/mcv4u7.md
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@ -189,6 +189,9 @@ $$P(A\cup B)=1$$
The **principle of inclusion and exclusion** forms a general rule for the union between two *independent* events: The **principle of inclusion and exclusion** forms a general rule for the union between two *independent* events:
$$P(A\cup B)=P(A)+P(B)-P(A\cap B)$$ $$P(A\cup B)=P(A)+P(B)-P(A\cap B)$$
For independent events:
$$P(A\cap B)=P(A)\times P(B)$$
### Conditional probability ### Conditional probability
A vertical bar is used between two events to denote that the event on the left occurs knowing that the right has already occurred. A vertical bar is used between two events to denote that the event on the left occurs knowing that the right has already occurred.