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x= {1, 2, 3, 4}, y= {1, 5, 9, 11, 15, 16...

`x= {1, 2, 3, 4},` `y= {1, 5, 9, 11, 15, 16}` which of the following relations are functions from x to y ?
(1) `f_(1)= {(1, 1) (2,11) (3,1) (4, 15)}`
(2) `f_(2)= {(1, 1) (2,7)(3,5)}`
(3) `f_(3)= {(1, 5) (2,9) (3, 1) (4, 5) (2, 11)}`

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The correct Answer is:
Only `f_(1) is a function
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