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Identification of function: A function is a relation in which each element of the domain is paired with exactly one element of the range.
\Observe the relation in the mapping, the relation is not a function. The element 4 in the domain paired with two elements 5 and 6 in the range. So, when input value 4 there is more than one possible value for output.![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
No, the relation is not a function.