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

Which of the following is the empty set?

A

`{x:x^2-1=0, x in R}`

B

`{x: x^2-1, x in R}`

C

`{x: x^2-4=0, x in R}`

D

`{x: x^2-x-2=0, x in R}`

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  • Which of the following is a null set

    A
    {0}
    B
    `{ x:x gt 0" or "x lt 0}`
    C
    `{ x:x^2 =4" or "x =3}`
    D
    `{x:x^2+1=0,x epsilon R}`

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    PVC
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    D
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    PVC
    B
    teflon
    C
    bakelite
    D
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