Let f: A → B. Then, the set A is known as the domain of f and the set B is known as the co-domain of f.
The set of f-images of elements of A (elements in set B associated with elements in set A) is known as the range of f or image set of A under f and is denoted by f(A)
Thus range of f = f(A) = {f(x): x Є A}
F(A) is a subset of B.
Range of f is a subset of co-domain of f.
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