PUMaC 2025 · 加试 · 第 6 题

PUMaC 2025 — Power Round — Problem 6

When a problem asks you to “find”, “show”, or “prove” a result, a formal proof is expected, in which you justify each step you take, either by using a method from earlier or by proving that everything you do is correct. When a problem asks you to “explain”, an informal explanation suffices.

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