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 3 Sum of series with non-common ratio 2 A proof in combinatorics (prove by any method) 2 Inscribed Square in Inscribed Circle in Square 1 Logarithm as an Exponent 1 Substituting the value $x=2+\sqrt{3}$ into $x^2 + 1/x^2$

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 5 Find $n$ if $2^{100} - 31 \cdot 2^{192} + 2^n$ is a perfect square. 4 Inequality $(x^2 + 3x + 1)\cdot(x^2 + 3x - 3) \geq 5$ 4 Proof in Arithmetic Progression 3 Is this result based on factorials true? 3 Does math have any end?

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 4 algebra-precalculus × 6 2 proof-writing 4 sequences-and-series × 2 2 binomial-coefficients 3 summation 1 arithmetic-progressions × 2 2 geometry × 4 1 trigonometry × 2 2 combinatorics × 2 1 systems-of-equations

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