IOM 2019, Блиц — Задача 68

OLYMPIAD OF METROPOLISES, Moscow, September 2, 2019 · 2 септември 2019 г.

Условие

Find the number of non-empty subsets $A$ of the set $\{1, \ldots, 36, 37\}$ such that $A$ has at most four elements and their sum is odd.

Решение

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Оригинал в Архива: blitz-en-all-task-final.pdf