Find the last digit of 7^2007

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Masum
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Re: Find the last digit of 7^2007

Unread post by Masum » Sun Jul 17, 2011 11:34 am

In fact, that's the question. As I said before, we have the period 4. Can you explain this?
Hint: $\varphi(10)=4$.
One one thing is neutral in the universe, that is $0$.

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