A + B + C + D = 1A & gt; 0 B & gt; 0 C & gt; 0 d & gt; 0P = 3A + 1 under root plus 3B + 1 under root plus 3C + 1 under root plus 3D + 1 under root

A + B + C + D = 1A & gt; 0 B & gt; 0 C & gt; 0 d & gt; 0P = 3A + 1 under root plus 3B + 1 under root plus 3C + 1 under root plus 3D + 1 under root

two