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Given A={2,\ 3,\ 4} , B={2,\ 5,\ 6,\ 7} ...

Given `A={2,\ 3,\ 4}` , `B={2,\ 5,\ 6,\ 7}` . Construct an example of a mapping from `A` to `B` which is not injective

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Given `A={2,\ 3,\ 4}` , `B={2,\ 5,\ 6,\ 7}`
Let `f:A->B`denotes a mapping such that
`f={2,2),(3,5),(4,5)}`
which shows that it is not an injective mapping.
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