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event
a subset of a sample space

sample space
all possible outcomes of a given experiment.

simple event
an event consisting of just one outcome. a simple event can be represented by a single branch of a tree diagram

compound event
a sequence of simple events.

complement
the complement of event e sometimes denoted e occurs when e dosent. the probabitity of e equals 1 minus the probabilityof e:p(e') =1p(e)

counting principle
if an event a can occur in m ways and for each of these m ways n event b can occur in n ways then events a nd b can occur in m*n ways . this counting principle can be generalized to more than two events that happen in succession. so if for each of the m and n ways a and b can occur respectivley there is also an event c that can occur in s ways then abc can occur in mns ways

tree diagram
a tree shaped diagram that illustrats sequentially the possible outcomes of a given event

outcomes
the possible results of an experiment

probability
 the chance something will happen
 probability = favorable outcomes
 total outcomes