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Let A={9, 10, 11, 12, 13, 14, 15, 16, 17...

Let `A={9, 10, 11, 12, 13, 14, 15, 16, 17}` and let `f:A to N` be defined by f(n)= the highest prime factor of `ninA`. Write f as a set of ordered pairs and find the range of f.

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The correct Answer is:
`= {2,3,5,7,11,13,17}`
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