Set \( A=\{1,2,3\} \) which of the following functions \( \mathrm{P...

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Set \( A=\{1,2,3\} \) which of the following functions
\( \mathrm{P} \)
on \( A \) is invertible?
W
(1) \( f=\{(1,1),(2,1),(3,1)\} \)
(2) \( f=\{(1,2),(2,3),(3,1)\} \)
(3) \( f=\{(1,2),(2,3),(3,2)\} \)
(4) \( f=\{(1,1),(2,2),(3,1)\} \)
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