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• 37 Make 6 5 4 3 = 81
• 24 (A → B) → (¬B → ¬A)
• 18 Can a Cauchy sequence converge for one metric while not converging for another?
• 6 Find the sum of the series $\sum_{n=1}^{\infty} \frac{2n+3}{n(n+1)(n+2)}$
• 6 Is there a non-constant function $f: \mathbb{R}_{>0} \to \mathbb{R}$ such that $f(x) = f(x + 1/x)$?
• 5 Why is "xiang4" in 摄像 and 照相 different from each other?
• 5 Limit of sum of areas of infinite amount of triangles
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