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Begrepp

Aritmetisk summa

Summeras talen i en aritmetisk talföljd får man dess aritmetiska summa. Är talföljden tillräckligt kort som exempelvis , kan man beräkna summan för hand: Summan är alltså . 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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