## 1. Let A and B be any two events then –

Note :-

## 2. If A and B be any two events in a sample spaces S then the probability of occurrence of at least one of the events A and B is P(A U B) = A(A) + P(B) – P(A∩B).

## 3. If A , B and C are any three events in a sample spaces S then –

## P(A U B U C) = P(A) + P(B) + P(C) – P(A∩B) – P(B∩C) – P(A∩C) + P(A∩B∩C)

## 4. General form of Addition of Probability :

## 5. For events A_{1} , A_{2} ……………………A_{n.}

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