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Topic: Help on 7^20 (mod 100)
Replies: 5   Last Post: Jul 5, 2007 11:23 AM

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Posts: 99
Registered: 2/24/07
Re: Help on 7^20 (mod 100)
Posted: Jul 4, 2007 4:20 PM
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student a écrit :

> What is the easiest way to calculate 7^20 (mod 100) ? Thanks for
> helping


7^2=49=50-1 so 7^4=50^2-2*50+1... It's now easy to finish.

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