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2014-09-28T20:27:55+03:00
11. 5^{n}+4. 5^{n+1} + 5^{n+2}=11. 5^{n}+4.5. 5^{n}+ 5^{2} . 5^{n} =11. 5^{n}+20. 5^{n}+25. 5^{n} \\ = 5^{n} (11+20+25)=5^{n}.56