Let A={1,2,3,4}, B={1,5,9,11,15,16} and f={(1,5), (2,9), (3,1), (4,5), (2,11)}
Is f a function from A to B? Why?
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f is not a function. Because 2∈ A has two images 9 ∈ B and 11 ∈ B.
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