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GENERAL INSTRUCTIONS FOR SOLVING
Feb 12’09
PROBABILITY PROBLEMS
For solving a probability problem first of all properly identify and designate all types
of the relevant events and the corresponding probabilities
given
in the condition of the
problem, and also the
asked for
probabilities. This includes the following steps.
1
. Designate the relevant
primary
events with the convenient capital letters
A, B
, … (with
_
or without subscripts); also designate the
complementary
events
Ā, B, …
(with or without
subscripts) if necessary. Introduce the corresponding probabilities and set numerical
values for those of them which are given explicitly (if any):
_
P(A) =
;
P(B) =
;
P(A
i
) =
;
P(B
i
) =
;
P(Ā) =
;
P(B) =
;
2.
Designate properly the relevant
compound
events:
A∩B
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 Spring '05
 Kzaer
 Probability

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