Question

1= 5
2= 25
3 = 125
4= 625
5 = ?

Answer 1

5*5=25
25*5=125
125*5=625
625*5=3125 means 5 = 3125
3125 is a answer

Answer 2

1=5
2=25 means (5*5)
3=125 means( 5*5*5)
4=625 means (5*5*5*5)
5=3125 means (5*5*5*5*5)

so the answer is 3125

       or 
in the question given that 1=5
then 5=1