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

Question:

The number of elements of an identity function defined on a set containing four elements is __________ .

Solution:

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

Four elements is four only

Since identity function maps same element to same element.

i.e x → x

y → y

z → z

and  w → w

There are four such elements.