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probability
 likely hood, what's the chance it will occur, numerical value between 0 and 1
 0 impossible
 1 definite event

sample space
all possible outcome (ex coin heads and tails)

experiment
when we do something to see what happens

event
is a description of the subset of the sample space

exhaustive
if all possible outcome of a random experiment are included in the events

mutually exclusive
if they dont share any common outcome of a random experiment

venn diagram
represents the sample space for the events

union
of two events (A u B), is the event consisting of all simple events in A or B

addition rule: union probability P(A or B)
the probability that event A or B occurs (the probability that a least one of these events occurs)

