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• 7 Visualising 3rd degree equations
• 6 Can two media have same refractive indices?
• 6 How to find $ \binom {1}{k} + \binom {2}{k} + \binom{3}{k} + ... + \binom{n}{k} $
• 6 How to show $\lceil ( \sqrt3 +1)^{2n}\rceil$ where $n \in \mathbb{ N}$ is divisible by $2^{n+1}$
• 6 Evaluating $(1+\cos\frac{\pi}{8})(1+\cos\frac{3\pi}{8}) (1+\cos\frac{5\pi}{8})(1+\cos\frac{7\pi}{8})$
• 5 A strange lier that tells truth on 7th day of the week.
• 5 Find the value of a + b + c + d
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