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Question

The population of town is 10000. Out of these 5400 persons read newspaper A and 4700 read newspaper B. 1500 persons read both the newspapers. Find the number of persons who do not read either of the two papers.

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Solution

Given: The population of town (ξ)=10000
No of people who reads newspaper A =n(A)=5400
No of persons who reads newspaper B =n(B)=4700
No of people who reads both newpapers =n(AB)=1500
n(AB)=n(A)+n(B)n(AB)
=5400+47001500=8600
and
n(AB)=n(ξ)n(AB)
=100008600=1400
No of persons who do read either of the papers are 1400.


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