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### Probability – A concept

The words probable, possible chance etc. are quite familiar to us. We use these words when we are not sure of the result of certain events. These words convey the sense of uncertainty of occurrence of events.

Probability is the word we use calculating the degree of the certainty of events in ideal conditions. An experiment means an operation which can produce some well defined outcomes. There are mainly two approaches in defining in the theory of the probability of the events of a random experiment:

- Classical Approach – This approach is given by Blaise Pascal.
- Axiomatic Approach – This approach is given by a Russion mathematician A. Kolmogorov in 1937.