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

Which of the following is the empty set?

A

{x|x is a real number and `x^2-1=0`}

B

{x|x is real, and `x^2+1=0`}

C

{x|x is real, and `x^2-9=0`}

D

{x|x is real and `x^2-x-2=0`}

Text Solution

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The correct Answer is:
B
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HIMALAYA PUBLICATION-SETS,RELATIONS AND FUNCTIONS-QUESTION BANK
  1. In rule method the null set, is represented by

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  2. Which of the following is the empty set?

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  3. If A={(x, y) : x^2+y^2=25) and B={(x, y) : x^2+9y^2=144), then A nn B ...

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  4. If A and B are any two sets then A -(A-B) is equal to

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  5. If A and B are any two sets then (AuuB) - (A nn B) =

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  6. If A and B are any two sets then A nn (A uu B)' =

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  7. A and B are two sets, then A-B = phi, if and only if

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  8. If A,B and C are non -empty sets , then (A-B) uu (B-A) equals :

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  9. If the sets A has p elements, B has q elements, then number of element...

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  10. If A = {x:x in N, (x^2-9)(x^2-5)=0} and B={x:x in N,x(x-2)(x-3)=0} whe...

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  11. If A {2, 4} and B= {3, 4, 5} then (AnnB) xx (AuuB) =

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  12. Let A ={1, 2}, B = {3, 4} and C = {4, 5}. Then (A-B) xx (B-C) is

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  13. If A = {1, 2, 3}, B= {3,8}, then (AuuB)xx(AnnB) is

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  14. If A = {1, 2, 3, 4} then the number of elements in A xx A is

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  15. Let A = {1, 2, 3, 4}, B= {2, 3, 4, 5}, then n[(A xx B)nn(B xx A)] is

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  16. If A = {2, 4} and B= {3, 4, 5}, then (A nn B) xx (B uu A)]

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  17. If A = {x:x^2-5x+6=0}, B = {2, 4}, C = {4, 5}, then Axx(B nn C) =

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  18. If aN = {an : n in N} and bn nn cN = dN where a, b, c, d in N and b...

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  19. Let N underseta = (an : n in N), then N underset6 in N underset8 is ...

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  20. Sets A and B have 3 and 6 elements respectively. What can be the minim...

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