# Square roots with \(a,b,c\)

**Algebra**Level 5

\[\large \sqrt{\dfrac{ab}{ab-c+2}}+\sqrt{\dfrac{bc}{bc-a+2}}+\sqrt{\dfrac{ca}{ca-b+2}}\]

Let \(a,b\) and \(c\) be positive real numbers satisfying \(a+b+c=1\). If the maximum value of the expression above can be written as \(\dfrac{m}{n}\), where \(m\) and \(n\) are coprime positive integers, find \(mn\).