which results in outcomes is called an experiment.
tossing a coin,rolling a die.
Event: An outcome of a
random experiment is called an event.
FavorableEvent: The favorableoutcome is called favorable event.
a head, getting even number on die.
of an event:
If there are n
elementary events associated with a random experiment and m of them are favorable
to an event , then the probability of happening or occurrence
of event A is denoted by and is defined as the ratio .
An event having only one outcome is
called elementary event.
For e.g .getting a head
For an event , the event
“not” is called complimentary event.
It is denoted by .
e.g.for event “getting even numbers”, the complimentary
event is “ getting odd
total no. of outcomes
total no. of favorable
event which is sure or which has probability is called sure event.
event which is not possible or which has probability is called impossible event.
of probabilities of all elementary:
of probabilities of all elementary events is .