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jwc845
  • Member for 5 years
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8
For any $a$, can we find $b$ and $c$ such that $\phi(a^2)+\phi(b^2)=\phi(c^2)$? ($\phi$ is Euler's totient function.)
5
Where to place 10 guards in a 17-walled art gallery such that removal of any one leaves the gallery unprotected?
5
A deck of $52$ cards is divided into four piles of $13$ cards. What is the probability that each pile has one ace?
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