example

05
Jun
Examples 5 to 8

(5) A bag contains  6  red and  4 white balls. Three balls are drawn at random. Find the probability that they are of  the same colour.

Soln. Let, A  :  Event of  getting two balls of  same colour.

P ( A ) =

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05
Jun
Examples

(1) In a throw of  a coin, find the probability of  getting a tail.

Soln. Here,   S   =   { H, T } ( i.e.  n  =  2 )  and   A   =   { H }  ( i.e.  m  =  1 ).

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05
Jun
Introduction

☼ Probability    :   In a random experiment, let S be the sample space and E be the event. Then, E \subseteq S.  Then, we define  (if  m  =  n…

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05
Jun
difference between mutually exclusive events and independent events

☼  Give the difference between mutually exclusive events and independent events.                                         

mutually exclusive even…

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05
Jun
Event

Event     :     The result  of  an  experiment  are  known as events:

e.g. (i) If a coin is tossed head ( H ) and tail ( T ) are two different events.

(ii) 1, 2, 3, 4, 5, 6 are different even…

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05
Jun
Sample  Space

Sample  Space     :     A set representing all possible outcomes of a random experiment is called a sample space and it is denoted by  S  or  U.

Each outcome is called a sample point. The number of sample points…

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05
Jun
Unbiased Experiment

Unbiased Experiment   :    If  each outcome of  the experiment is equally likely to occur,  then the experiment is known as an unbiased experiment.

 e.g. When we throw a coin, …

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