Find the function

Question

If f(1)= 1 , f(2)=2, f(3)=3 , f(4)=4, and f(0)=24

Find f(5) 

Answer 1

It's impossible to tell because the function definition (rule) is not given. [For all we know, it might be a piecewise function or perhaps 5 isn't even in the domain.]