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2014-10-08T22:51:37+03:00
5^{n} +5^{n-1} + 5^{n-2} =12²+3²+2
 5^{n} (5+5⁻¹+5⁻²)=12²+3²+2

 5^{n} (25*5+5*5+1/25)=12²+3²+2
 5^{n} (251/25)=12²+3²+2


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