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バA立@米ええ0肖の史その②ヶ "6も率?叶ツ 6 ネタばを をスシンも多人 ヶ記うう^半6@ せみえせタタ立目ウ問のと6

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✨ Best Answer ✨

(n-1)²+n²+(n+1)²=3n²+2
よって3で割った余りは2

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