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Let A={1,2,3},B={5,6,7} and f:A to B be ...

Let `A={1,2,3},B={5,6,7}` and `f:A to B` be a function defined as `f={(1,6),(2,5),(3,7)}` Then f is :

A

one -one but not onto

B

onto but not one-one

C

both one - one onto

D

neither one - one nor onto

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