Question

If a set A has n elements, then number of functions that can be defined from A into A is
a) n^2
b) n!
c) n^n
d) n

Answer 1

Answer on Question 37675, Math, Other Function is correspondence between argument and value of function. There are n possible x and y possible y that correspond to them. Hence, number of function is:

$n\times n=n^{2}$