Răspunsuri

2014-10-27T15:38:09+02:00
S = 1+6+6² +........+6^2013        6S = 6+6² +6³ +..........+6^2014   
6S-S = 5S = 6^2014 - 1 ⇒  S = (6^2014 - 1)/5
8 4 8