Probability is the branch of mathematics which deals with the study of random phenomenons and probability of occurrence of events.
Some basic probability formulas are:
Notations use in Probability:
= probability of event A.
= probability of event A or B.
= probability of event A and B.Probability Formulas:
1. Probability of an event “A” is:
= (Number of outcomes favorable to “A”) ÷ (Total numbers of outcomes)
2. For any two events “A” and “B” :
3. For any three events “A” , “B” and “C”:
4. For mutually exclusive events “A” , “B” and “C” ( or if
and 
) :
and
5. For two independent events “A” and “B”:
and
6. If
is the event complimentary to “A” then:
7. If the occurrence of event “A” is dependent on the occurrence of event “B” then:
1. Probability of an event “A” is:
= (Number of outcomes favorable to “A”) ÷ (Total numbers of outcomes)2. For any two events “A” and “B” :
3. For any three events “A” , “B” and “C”:
4. For mutually exclusive events “A” , “B” and “C” ( or if
and ) :and
5. For two independent events “A” and “B”:
and
6. If
is the event complimentary to “A” then:7. If the occurrence of event “A” is dependent on the occurrence of event “B” then:
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