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- 8 A Number Game puzzle
- 6 Proving inequality $\frac{n}{2} < 1 + \frac{1}{2} + \frac{1}{3} + \frac{1}{4} + \frac{1}{5} + ... + + \frac{1}{2^{n}-1} < n$
- 6 Evalute big determinant
- 6 Prove that formula is satisfiable in some infinite structure, but invalid in all finite structures
- 5 Definition of an immune set
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