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b) konvergen
2 a) S = a/(1-r)
r = 6/18 = 1/3
S = 18 / (1 - 1/3)
= 18 / (2/3) = 27
b) r = 8 / (-12) = - 2/3
S = -12 / {1-(-2/3)}
= -12 / (5/3) = - 7 1/5