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Is R = {(2,1), (3,1), (4,2)} a function?
ANo, because 1 repeats as an output
BNo, because it has just three pairs
CYes, each input has one output
DYes, but only if 1 is not repeated
Answer & Solution
Correct answer: C. Yes, each input has one output
Each of 2, 3 and 4 has exactly one image; different inputs may share an image.
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