Geometrisk rekke
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∑rn=1/(1−r)\sum r^n=1/(1-r)∑rn=1/(1−r), ∣r∣<1|r|<1∣r∣<1. Endelig: (1−rN+1)/(1−r)(1-r^{N+1})/(1-r)(1−rN+1)/(1−r). Divergerer for ∣r∣≥1|r|\geq 1∣r∣≥1.
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