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  4. The number of bijective functions from the set A to itself, if A contains 108 elements is -

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Q. The number of bijective functions from the set $A$ to itself, if $A$ contains $108$ elements is -

COMEDKCOMEDK 2015Relations and Functions - Part 2

Solution:

Since number of one-one onto functions from a set A having n elements to itself is n!.
We have the set A that contains 108 elements, so the number of bijective functions from set A to itself is 108!