1.

Which of the following is the empty set ?

Answer»

`{x :x` is a REAL number and `x ^(2)-1=0}`
`{x:x` is a real number and `x ^(2) +1=0}`
`{x:x` is a real number and `x ^(2) -9=0}`
`{x:x` is a real number and `x ^(2) =x+2}`

ANSWER :B


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