IOM 2017, Блиц — Задача 52

OLYMPIAD OF METROPOLISES. Moscow, September 4 · 4 септември 2017 г.

Условие

In an arithmetic sequence, the arithmetic mean of the first ten terms equals 6, while the arithmetic mean of the first twenty terms equals 16. Find the 15th term of the sequence.

Отговори

Решение

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Оригинал в Архива: blitz.pdf · официални решения: answers-blitz.pdf