http://lanceupper.livejournal.com/ ([identity profile] lanceupper.livejournal.com) wrote in [personal profile] juan_gandhi 2010-02-10 12:29 am (UTC)

А явно суммировать ничего и не надо. Формулу суммы N первых членов арифметической прогрессии проходят в школе.
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