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Chemistry
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user233658
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CuCl2 dissolved in water
Jun 1, 2015
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8
Prove: if $n\mid 7^n+6^n$ and $n>1$, then $13\mid n$
7
Do animals get sick with hemorrhoids?
6
How can one show that $|(a-b)(b-c)(c-d)(d-a)|\le\frac{abcd}{4}$
5
If $\sqrt{\frac{n+15}{n+1}}\in\mathbb Q$, then $n=17$
5
What is the angle $\widehat{BAC}$?