a RARE mistake from Euler (AIME 1989)
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One of the easiest Putnam Exam questions!
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Math for fun, how many rectangles?
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Euler's Original Proof Of Basel Problem: Σ(1/n²)=π²/6 — BEST Explanation
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exact value of sin(3 degrees)
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The hardest "What comes next?" (Euler's pentagonal formula)
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You, Me and The Legend of Question 6
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UNCRACKABLE? The Collatz Conjecture - Numberphile
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