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total # of outcome = multiplication of all possible outcomes 


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order doesn't matter n!/((nk)!k!) has the "deordering" agent 


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disjoint/ mutually exclusive 

Definition


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 an event based on a an event that already occured prob. where we condition on some previous knowledge P(AIB)=p(A intersect B)/ P(B) 


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and = multiply or= addition 


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Definition
situation 1+ situation 2+ ... untill all possible choices are exhausted 


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=unrelated events P(A intersect B) =P(A)P(B), such that P(BIA)=P(B) 


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mass distribution function/ probability mass function 

Definition
make a chart chance that a X=x, where big X is the random variable. 


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cumulative distribution function 

Definition
F(x)=P(X less than or equal to x) 


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discrete random variables 

Definition
countably infinite number of variable 


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continuos random variables 

Definition
a continuous range of variables... allowed to take any in between numbers 


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complementaries of (a intersect b) and of (a union b) 


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set of 2 that don't intersect any other set of 2 things 


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the chance of an event occuring value between 1 and 0 


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Definition
p(x)=P(X=x) which is greater than or equal to zero. sum of all p(x)=1 

