Question

Check whether 15 to the power n can end with zero for any natural number n.

Answer 1

no it did not ends with zero because 
number 15 should have 2 and 5 both prime numbers

15=3*5 it has only prime number 5 so it doesn't ends with zero

example 10 = 2*5  it has both prime numbers 2 and 5 
so its ends with zero