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 General Aptitude
 Probability
 Important Formulas
1.  Experiment:  
An operation which can produce some welldefined outcomes is called an experiment.  
2.  Random Experiment:  
An experiment in which all possible outcomes are know and the exact output cannot be predicted in advance, is called a random experiment.  
Examples:  


Details:  


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


4.  Event:  
Any subset of a sample space is called an event.  
5.  Probability of Occurrence of an Event:  
Let S be the sample and let E be an event.  




6.  Results on Probability:  
