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In a college of 300 students, every stud...

In a college of 300 students, every student reads 5 newspapers and every newspaper is read by 60 students. The number of newspaper is

A

atleast 30

B

atmost 20

C

exactly 25

D

exactly 30

Text Solution

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The correct Answer is:
C
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NEW JOYTHI PUBLICATION-SETS-EXERCISE
  1. In a class of 100 students, 55 have passed in mathematics and 67 have ...

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  2. Out of 800 boys in a school, 224 played cricket, 240 played hockey and...

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  3. In a college of 300 students, every student reads 5 newspapers and eve...

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  4. If A and B are two given sets then Acap (A capB)^(c) is equal to

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  5. Let n(U)=700, n(A)=200, n(B)=300 and n(AcapB)=100, then n(A^(c)capB^(c...

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  6. In Rule Method the null set is represented by

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  7. If A and B are not disjoint sets then n(AcupB) is equal to

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  8. Let A and B be two sets such that n(A)=0.16, n(B)=0.14, n(AcupB)=0.25 ...

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  9. In a city 20% of the population travels by car, 50% travels by bus and...

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  10. Given n(U)=20, n(A)=12, n(B)=10, n(AcapB)=4 where U is the universal s...

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  11. If A={x:f(x)=0} and B={x:g(x)=0} then AcapB will be

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  12. Let A and B be two non empty subsets of a set X such that A is not a s...

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  13. If A={phi,{phi}}, then the power set of A is

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  14. If a set A has n elements, then the total number of subset of A or the...

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  15. The number of non empty subset of the set {1,2,3,4} is

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  16. If A={x:x is a multiple of 3} and B={x:x is multiple of 5} then A-B is

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  17. Which of the following is empty set?

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  18. In Rule Method the null set is represented by

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  19. The number of subsets of {1,2,3,. . . . . .,9} containing atleast one ...

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  20. Given A={x:x is a root of x^(2)-1=0} B={x:x is a root of x^(2)-2x+1=0}...

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