If H, G, S, I are respectively Orthocenter, centroid, circumcentre and Incentre of a triangle formed by the points (1,2,3), (2,3,1) and (3, 1, 2) then H + G + S + I =

Given that the vertices of a triangle are (1,2,3), (2,3,1) and (3, 1, 2)

Observing the above three points, the triangle formed by the given three points is an equilateral triangle

Centroid of the triangle is $G=\left(2,2,2\right)$

Since it is an equilateral triangle, all the centers are coincident

hence, $H+G+S+I=\left(8,8,8\right)$