1.

Out of the following which is a function?

Answer»

`{(X,y): x, y in R " " y^(2)= x}`
`{(x,y): y = |x|, x y in R}`
`{(x,y): x^(2) + y^(2)=1, x, y in R}`
`{(x, y): x^(2)-y^(2)=1, x, y INR}`

Answer :B


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