Probability - QA Formulae

By BYJU'S CAT|Updated : June 10th, 2023

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The probability formula is used to compute the probability of an event.

In other words, the likelihood of an event happening is called probability.

Random experiments: An experiment is called random experiment if it satisfies the following two conditions:

(i) It has more than one possible outcome.

(ii) It is not possible to predict the outcome in advance.

Outcome: A possible result of a random experiment is called its outcome.
Sample space: The set of all possible outcomes of an event is called its sample space.

Where,

P(A) is the probability of an event ‘A’.
n(A) is the number of favourable outcomes of Event A.
n(S) is the sample space.

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9. Equally likely events: When two or more events have an equal chance of happening or equal probability of occurrence, then those events are called equally likely events.