Question

3. Check whether 6" can end with the digit o for any natural number n​

Answer 1

If the number 6n ends with the digit zero (0), then it should be divisible by 5.

Therefore, the prime factorization of 6n doesn't contain prime number 5.

Hence, it is obvious that for any natural number n, 6nis not divisible by 5.

Thus it proves that 6n cannot end with the digit 0 for any natural number n.