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An operation which results in some well-defined outcomes is called an experiment.

Random experiment

An experiment whose outcome cannot be predicted with certainty is called a random experiment. In other words if an experiment is performed many times under similar conditions and the outcome each time is not the same, then this experiment is called a random experiment.

Sample space

The set of all possible outcomes of a random experiment is called the sample space for that experiment. It is usually denoted by S.

When two coins are tossed.

Sample space S = {(HH), (HT), (TH), (TT)}, where HT denotes occurrence of head and tail respectively.

Sample point or event point

Each element of the sample space is called a sample point or an even point.

When a die is thrown sample space S = {1, 2, 3, 4, 5, 6}

Here 1, 2, 3, 4, 5, and 6 are the sample points.

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