Definition of a function :
A function is a special type of relation in which each element of the domain is paired with exactly one element of the range.
The relation in figure is not a function because each element in the domain does not corresponds to exactly one element in the range.
The domain of the function is .
The range of the function is .
The element of the domain is paired with more than one element of the range, i.e, and .
Thus, the relation in figure is not a function.
The relation in figure is not a function.
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