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Aritmetisk summa

Summeras talen i en aritmetisk talföljd får man dess aritmetiska summa. Är talföljden tillräckligt kort som exempelvis 1,3,5,7, kan man beräkna summan för hand:
s=1+3+5+7=16
Summan är alltså s=16. Är talföljden längre kan det dock bli jobbigt att addera elementen för hand. Istället kan man använda formeln för en aritmetisk summa.

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