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**Introduction**

In everyday life we come across statements such as:

(i) There is a change that it will rain today.

(ii) I doubt that India will won the match today.

The words chance, doubt are the words which show uncertainity of happening or not happening of an event which is in mathematical language is called Probability.

**Note: ** Probability tells us how likely an event is to occur.

**Some terms related to Probability**

**1. Experiment : **An operation which can produce some well defined outcomes, is called an experiment.

**2. Event : **Each outcomes in an experiment is called an event.

**3. Random experiment:** An experiment in which all possible outcomes are known and the exact outcome cannot be predicted in advance, is called a random experiment.

**4. Trial:** By a trial, we mean performing a random experiment.

**Some eg. of experiment:**

(a) Throwing a coin. (b) Throwing two coins

(c) Throwing a dice. (d) Drawing cards from pack etc.

**5. Sample Space : **The collection of all possible outcomes of a random experiment is called a sample space associated with it and is generally denoted by S. For example, When a die is thrown then S = { 1, 2, 3, 4, 5, 6 }.

**6. Favourable Event :** Let S be a sample space associated with a random experiment and A be an event associated with the random experiment. The elementary events belonging to A are known as favourable events to the event A.

**For example : **In throwing a pair of dice, A is defined by “Getting 8 as the sum”. Then following elementary event has : (2, 6), (3, 5), (4, 4), (5, 3), (6, 2) as favourable outcomes.

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