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Check wheather 7^n can end with the digit zero for any natural number |
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Answer» 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. |
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