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calculati
1+6+6^2+.......+6^2013



Răspuns :

S = 1+6+6² +6³+.........+6^2013    6S = 6+6² +6³+..............+6^2014
6S - S = 5S = 6^2014 - 1 ⇒ S = (6^2014 - 1)/5