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Example In a class there are 13 students. 5 of them are boys and the rest are girls. Find the probability that two students selected at random wil be both girls.

Solution : Two students out of 13 can be selected in ways and two girls out
of 8 can be selected in ways.

 Therefore, required probability = 

Example A box contains 5 white balls, 4 black balls and 3 red balls. Three balls are drawn randomly. What is the probability that they will be (i) white (ii) black (iii) red ?

Solution : Let W, B and R denote the events of drawing three white, three black and
three red balls respectively.

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7. 1 Introduction
7.2 Trial
7.3 Sample Space
7. 4 Definition of Probability
7. 5 The Laws of Probability
7. 6 Conditional Probability
7. 7 Theoretical Distribution
7. 8 Binomial Distribution
7. 9 Normal Distribution
Chapter 8

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