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In a population study of 1500 Indian rivers the following data were reported: 520 were polluted by sulphur compounds, 335 were polluted by phosphates, 425 were polluted by crude oil, 100 were polluted by both crude oil and sulphur compounds; 180 were polluted by both sulphur compounds and phosphates, 150 were polluted by both phosphates and crude oil and 28 were polluted by sulphur compounds, phosphates and crude oil.\[\] i) Find the number of rivers which were polluted by atleast one of the three impurities.\[\] ii) Find the number of rivers which were polluted by exactly one of the three impurities.

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(i) ) 878
(ii) 504
answered Jun 24, 2014 by thanvigandhi_1
 

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