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Which one the following relations on ...

Which one the following relations on `A={1,\ 2,\ 3}` is a function? `f={(1,\ 3),\ (2,\ 3),\ (3,\ 2)},\ \ g={(1,\ 2),\ (1,\ 3),\ (3,\ 1)}`

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As, each element of the domain set has unique image in the relation `f={(1,3),(2,3),(3,2)}`

So, `f` is a function.

Also, the element 1 of the domain set has two images 2 and 3 of the range set in the relation `g={(1,2),(1,3),(3,1)}` So, `g` is not a function.

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