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2014-05-11T13:06:55+03:00
S1=-1+(-1)+(-1)+...+(-1) S1= -1-1-1-1..-1 de 50 S1=-1*50 S1=-50 S2=-2(1+2+3+...50) S2=-2(1+50)*50/2 S2=-50*(1+50) S2=-50*51 S2=-2550
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