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If A and B are not disjoint sets then n(...

If A and B are not disjoint sets then n(A`cup`B) is equal to

A

n(A)+n(B)

B

n(A)+n(B)-n(A`cap`B)

C

n(A)+n(B)+n(A`cap`B)

D

n(A)-n(B)+n(A`cap`B)

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The correct Answer is:
B
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NEW JOYTHI PUBLICATION-SETS-EXERCISE
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  4. Let n(U)=700, n(A)=200, n(B)=300 and n(AcapB)=100, then n(A^(c)capB^(c...

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  5. In Rule Method the null set is represented by

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

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

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

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

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

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

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

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  15. 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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  16. Which of the following is empty set?

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  17. In Rule Method the null set is represented by

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

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  19. 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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  20. If A={1,2}, B={{1},{2}}, C={{1},{1,2}}. Then which is true?

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