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Physical Properties (Group 1)

If f: A → B i...

Question

If f : A → B is an injection, such that range of f = {a}, determine the number of elements in A.

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Solution

Range of f = {a}
So, the number of images of f = 1
Since, f is an injection, there will be exactly one image for each element of f .
So, number of elements in A = 1.

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