Question

check wheather 7^n can end with the digit zero for any natural number​

Answer 1

Making math visible is the key.

Let's make it clear.

Unit digit  |  7ⁿ

      7        |   7¹

      9        |  7²

      3        |  7³

      1         |  7⁴

If we multiply seven again to 7⁴, it will repeat again. Therefore, it is possible to get 1, 3, 7, 9.

It is not possible to get 0.

Answer 2

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