Answer: **True**.

Functions can be both one-to-one and onto.

Such functions are called **Bijections **and are are both injective and surjective.

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Fill in the blank: A function f : X → Y is said to be ______, if every element of Y is the image of some element of X under f, i.e., for every y ∈ Y, there exists an element x in X such that f (x) = y.

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