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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 a real number and `x^(2)+1=0}`

C

`{x:x` is a real number and `x^(2)-9=0}`

D

`{x:x` is a real number and `x^(2)=x+2}`

Text Solution

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The correct Answer is:
B
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ML KHANNA-CONCEPTS OF SET THEORY -Problem Set (1)
  1. Comment on the following statements ADeltaB=(AuuB)-(AnnB)

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  2. For two sets A and B, Ann(AuuB)=

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  3. Which of the following is the empty set ?

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  4. The number of bijective functions from set A to itself when A contains...

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  5. If X and Y are two sets, then Xnn(YuuX)' equals

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  6. if set A and B are defined as A={(x,y):y=e^(x),x in R} B={(x,y):y=...

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  7. Let A={(x,y):y=e^(x) , x in R } B={(x,y),Y=e^(-x) ,x in R}then

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  8. Given A={1,2,3},B={3,4},C={4,5,6}, the AU (B U C)=

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  9. If A={2,3},\ B={4,5},\ C={5,6},\ \ fin d\ Axx(BuuC),\ Axx(BnnC),\ (Axx...

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  10. If A={2,3},\ B={4,5},\ C={5,6},\ \ fin d\ Axx(BuuC),\ Axx(BnnC),\ (Axx...

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  11. If A={2,3,5},B={2,5,6}, then (A-B)times(A nn B) is

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  12. If A {1,2}, B = {1,3}, " then " (A xx B)cup (B xx A) is equal to

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  13. If A={2,4}andB={3,4,5}, then (AnnB)xx(AuuB) is

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

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  15. If A={1,2,3,4,5} andB={2,3,6,7}, then the number of elements in the se...

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  16. If A={a,b,c},B={c,d,e},C={a,d,f}, then Axx(BuuC) is

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  17. A and B are teo sets having 3 and 5 elements respectively and having 2...

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  18. Sets A and B have 3 and 6 elaments respectively. What can be theminimu...

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  19. Suppose A1,A2….. A(30) are thirty sets each having 5 elements and B1B2...

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  20. Consider the set A of all determinants of order 3 with entries 0 or 1 ...

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