Ustal ogolny wzor ciagu: a) -1,1,-1,1,-1,1,-1,1 b) 1,-1/2,1/3,-1/4,1/5,-1/6,1/7
a) an = (-1)^n
b) an = (-1)^(n+1) / n
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a) an = (-1)^n
b) an = (-1)^(n+1) / n