The number of elements of an identity function defined on a set containing four elements is______

2^{2}

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2^{4}

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2^{8}

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2^{16}

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Solution

The correct option is A $2^{2}$
If an element is related to itself, it is called an identity function. That is $f (x) = x$
So, if the set has $4$ elements, then the function will also have $4 = 2^{2}$ elements.

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