Question

Please give me the solution of the 6th question

Answer 1

6 raise to power n cannot end with the digit 0 because in its prime factors are of the form 2×3 raise to power n and for a digit to end with 0 its prime factors should be of the form 2 raised to power x and 5 raise to power y (where x and y are natural numbers). So it doesn't end with a digit 0.