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If f:{(1, 2), (2,3), (3, 1)}, then fof=...

If `f:{(1, 2), (2,3), (3, 1)}`, then `fof=`

A

`cancel(O)`

B

f

C

`{(1, 3), (2, 1), (3, 2)}`

D

`{(1, 1), (2,2), (3,3)}`

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