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cn = (-5)^n / 10
cn+1 = (-5)^(n +1)/10
cn+1 : cn = [ (-5)^(n +1)/10] : [(-5)^n / 10] =
= (-5)*(-5)^n : (-5)^n = -5
q = -5
Ciag ( cn) nie jest ani rosnący, ani malejący.
Jest naprzemienny.