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2014-09-21T21:31:09+03:00

S =1+1 +2 +2² +2³ +...........+2^(2n-1) = 2+2 +2² +2³+ ................+2^(2n-1) = 2²+2² +2³+..........+2^(2n-1) = 2³ +2³ +2^4 +.........+2^(2n-1) = ................... = 2^(2n-1) + 2^(2n-1) = 2^2n      √2^2n = 2^n =2^15  ⇒ n =15
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