PUMaC 2025 · 代数（A 组） · 第 4 题

PUMaC 2025 — Algebra (Division A) — Problem 4

2025 X 4050 S = cos(3 j ) . 2025 + j j =1 n What is the largest positive integer n such that 2 divides ⌊ S ⌋ ? 2

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