rd sharma class 10 solutions chapter 13 probability

RD Sharma Class 10 Solutions Chapter 13: Probability

Summary:

We find the probability of the occurrence of an event by actually performing the experiment a number of times and adequate recording of the happening of event.
An Outcome of a random experiment is called an elementary event.
Probability of an event E, written as P(E), is defined as $P(E)=\frac { Number\quad of\quad outcomes\quad favourable\quad to\quad E }{ Number\quad of\quad all\quad possible\quad outcomes\quad of\quad the\quad experiment }$
An event associated to random experiment is a compound event if it is obtained by combining two or more elementary events associated to the random experiment.
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.
The probability of a sure event (or certain event) is 1.
The probability of an impossible event is 0
The probability of an event E is a number P(E) such that $0\le P(E)\le 1$
For any event E, $P(E)+P(\overline { E } )=1$ , where $\overline { E }$ stands for â€˜not E’. E and $\overline { E }$ are called complementary events.