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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