Tamil Nadu Board of Secondary EducationSSLC (English Medium) Class 10




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  • Probability of an Event



  • Probability is the extent to which an event is likely to occur.

  • Probability is the branch of mathematics that measures the uncertainty of the occurrence of an event using numbers.

  • It is expressed as a fraction or percentage using the following formula.

  • The probability of an event is a number between 0 and 1, where, roughly speaking, 0 indicates the impossibility of the event, and 1 indicates certainty.

  • The higher the probability of an event, the more likely it is that the event will occur.

  • For a random experiment, if sample space is ‘S’and ‘A’ is an expected event then the probability of ‘A’ is P(A). It is given by the following formula.

          P(A) = `"Number of sample points in event A"/"Number of sample points in sample spaces" = "n(A)"/"n(S)"`.

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