Probability (P): The chance of occurrence of a particular event. 
Experiment : An experiment is an operation which can produce welldefined outcomes. 
Random Experiment : The experiment when all possible outcomes of an experiment are known but exact outcome cannot be predicted in advance. E.g. Tossing fair coin, rolling an unbiased dice and drawing a card from a pack of shuffled cards. 
Sample Space (S): The set of all possible outcomes of an experiment and denoted by S. Eg. When coin tossed, S = {H, T} where H = Head and T = Tail 
Event (E): Any subset of a sample space. 
Probability of occurrence of an Event : E ⊆ S P(E) = n(E)/n(S) 
Results on Probability :

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