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In a school there are 20 teachers who te...

In a school there are 20 teachers who teach mathematics or physics. Of these, 12 teach mathematics and 4 teach both physics and mathematics. How many teach physics ?

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The correct Answer is:
`= 12`
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KUMAR PRAKASHAN-SETS-PRACTICE WORK
  1. Taking the set of natural numbers as the universal set, write down the...

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  2. U= {x|x in N, 1 le x le 10}, A= {1, 3, 5, 7, 9}" and "B= {2, 5, 8}. Ve...

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  3. Fill in the blanks to make each of the following a true statement : ...

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  4. Fill in the blanks to make each of the following a true statement : ...

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  5. Fill in the blanks to make each of the following a true statement : ...

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  6. Fill in the blanks to make each of the following a true statement : ...

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  7. Fill in the blanks to make each of the following a true statement : ...

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  8. Fill in the blanks to make each of the following a true statement : ...

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  9. In a town, 20% population travel by car, 50% travel by bus and 10% pop...

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  10. Out of 100 students, 55 passed in Mathematics and 67 passed in Physics...

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  11. In a survey of a society, 1000 people speak Gujarati or Hindi. 50% peo...

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  12. In a school there are 20 teachers who teach mathematics or physics. Of...

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  13. If A and B be two sets containing 3 and 6 elements respectively. What ...

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  14. In a twon of 840 persons, 450 persons read Hindi 300 read English and ...

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  15. There are 880 boys in a school. Out of these 224 boys play cricket, 24...

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  16. A students has freedom to study any subject of his choice. In a group ...

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  17. In a class of 30 students, 12 students like emboidary, 16 students lik...

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  18. A and B are two sets. (A - B) cup B= A if and only if B sub A.

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  19. A - (B capC) = (A - B) cap (A-C) .

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  20. For any two sets A and B, prove that A cup B= A cap B iff A = B.

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