If A and B are the events associated with a random experiment then

provided P(A)≠ 0

and

provided P(B)≠ 0

If A, B and C are three events associated with a random experiment, then

If A_{1}, A_{2}....A_{n} are associated with a random experiment, then

Two events are called independent if the occurrence or non-occurence of one does not affect the probability of the occurence
of the other.

Two events A and B associated with a random experiment are independent if

provided P(B)≠ 0

andprovided P(A)≠ 0

Also

If A_{1}, A_{2}....A_{n} associated with a random experiment are independent then

If A, B are independent events, then so are

or

or

or

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