Quantitative Aptitude Important Formulas

Probability - Important Formulas,Tricks and Examples

Sample space: When we perform an experiment ,then the set S of all possible outcome is called the sample space.eg of sample space:

(i)in tossing a coin ,s={h,t}
(ii)if two coin are tossed ,then s={hh,tt,ht,th}.
(iii)in rolling a die we have,s={1,2,3,4,5,6}.

Event: Any subset of a sample space.

Probability: Probability is quantitative measure of the chance of occurrence of a particular event..let S be the sample space and E be the event .then,E subset of S.then


(i) P(S) = 1 (ii) 0<P(E)<1

If A denotes (not-a),then P(A)=1-P(A).

Let A and B be two events associated with a random experiment. Then
P(A U B) = P(A) + P(B) – P(A ∩ B)

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