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In a pollution study of 1500 Indian rive...

In a pollution study of 1500 Indian rivers the following data were reported. 520 were pulleted 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. How many of the rivers were polluted by atleast one of the three impurities?
How many of the rivers were polluted by exactly one of the three impurities?

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NCERT GUJARATI-SETS-MISCELLANEOUS EXERCISE ON CHAPTER 1
  1. In a pollution study of 1500 Indian rivers the following data were rep...

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  2. Decide, among the following sets, which sets are subsets of one and a...

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  3. In each of the following, determine whether the statement is true or f...

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  4. In each of the following, determine whether the statement is true or f...

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  5. In each of the following, determine whether the statement is true or f...

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  6. In each of the following, determine whether the statement is true or f...

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  7. In each of the following, determine whether the statement is true or f...

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  8. In each of the following, determine whether the statement is true or f...

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  9. Let A, B, and C be the sets such that A ∪ B = A ∪ C and A ∩ B = A ∩ C....

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  10. Show that if A ⊂ B, then C – B ⊂ C – A.

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  11. Assume that P ( A ) = P ( B ). Show that A = B

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  12. Is it true that for any sets A and B, P ( A ) ∪ P ( B ) = P ( A ∪ B )?...

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  13. Show that for any sets A and B, A = ( A ∩ B ) ∪ ( A – B ) and A ∪ ...

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  14. Using properties of sets, show that A ∪ ( A ∩ B ) = A

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  15. Using properties of sets, show that A ∩ ( A ∪ B ) = A.

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  16. Show that A ∩ B = A ∩ C need not imply B = C.

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  17. Let A and B be sets. If A ∩ X = B ∩ X = φ and A ∪ X = B ∪ X for some s...

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  18. Find sets A, B and C such that A ∩ B, B ∩ C and A ∩ C are non-empty s...

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  19. In a survey of 600 students in a school, 150 students were found to be...

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  20. In a group of students, 100 students know Hindi, 50 know English and 2...

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  21. In a survey of 60 people, it was found that 25 people read newspaper H...

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