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If a and B are disjoint sets, then n(A u...

If a and B are disjoint sets, then `n(A uu B)=` _______

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The correct Answer is:
`n(A)+n(B)`
Since A and B are disjoint sets, `A nn B=phi`
`n(A nn B)=0`
`n(A uu B)=n(A)+n(B)-n(A nn B)`
`n(A uu B)=n(A)+n(B)`
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PEARSON IIT JEE FOUNDATION-SETS-VERY SHORT ANSWER TYPE
  1. The set builder form of A={1, 4, 9, 16, 25} is .

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  2. If A and B are two equivalent sets and n(A)=2016, then n(B)= .

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  3. If phi is an empty set, then n(phi)= .

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  4. The set of prime number which are having more then two factor is a/an ...

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  5. Which of the following is a singleton set ?

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  6. Let A be the set of all triangles in a plane having the sum of three i...

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  7. Which of the following is an infinite set ?

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  8. Which of the following is an empty set ?

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  9. Which of the following collection is not a set ?

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  10. Match the following Column A to Column B

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  11. If a and B are disjoint sets, then n(A uu B)=

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  12. If A={x : x" is prime"} and B={x : x" is even"}, then A nn B=

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  13. If A nn B=phi, then a and B are called sets.

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  14. If A and B are two non-empty sets, then the minimum number of elements...

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  15. If all the elements of set A are present in set B, then A uu B= .

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  16. If n(A)=2016 and n(B)=2017, then the minimum number of elements in A u...

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  17. If A is collection of natural numbers which are less than 2 and B={x :...

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  18. If A={x : x in N, x" is an additive inverse of "2017} and B={x : x in ...

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  19. If A={x : x in N, 2015 lt x lt 2017} B={x : x in N, x+1=2017}, then A-...

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  20. Match the following Column A to Column B

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