# NCERT Class 10 Mathematics Chapter 15 Probability

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## Summary

In this chapter, you have studied the following points:

1. The difference between experimental probability and theoretical probability.

2. The theoretical (classical) probability of an event E, written as P(E), is defined as

where we assume that the outcomes of the experiment are equally likely.

3. The probability of a sure event (or certain event) is 1.

4. The probability of an impossible event is 0.

5. The probability of an event E is a number such that

6. An event having only one outcome is called an elementary event. The sum of the probabilities of all the elementary events of an experiment is 1.

7. For any event , , where stands for ‘not . and are called complementary events.