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• 37 How to prove $b=c$ if $ab=ac$ (cancellation law in groups)?
• 21 Product of logarithms, prove this identity.
• 17 Sum of $1-\frac{2^2}{5}+\frac{3^2}{5^2}-\frac{4^2}{5^3}+....$
• 16 Conjecture: Every prime number is the difference between a prime number and a power of $2$
• 15 $f(550)$ if $f(11)=1$ and $f(a)f(b)=f(a+b)+f(a-b)$
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