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Conditional probability. Independence of events

 

Conditional probability. Independent and dependent events.

 

The probability of occurrence of an event  A at the condition, that an event B takes place, is called  the conditional probability and calculated by the formula:

 

where   ,   ( ) 0.

 

The events  ,  are independent events, if    ( ) = ( ) ( ).

Otherwise, the events  and are called  dependent events.

 

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