deungchageupsu
arithmetic series
série arithmétique
등차급수의 합은 첫 번째 항과 마지막 항의 평균에 항의 개수를 곱한 것과 같습니다.
Deungchageupsuui hapeun cheot beonjjae hanggwa majimak hangui gyungryeon-e hangui gaesul-eul gophan geosgwa gatseumnida.
The sum of an arithmetic series is equal to the average of the first and last terms multiplied by the number of terms.
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