If points (1,2,3), (0,-4,3), (2,3,5) and (1,-5,-3) are vertices of tetrahedron, then the point where lines joining the mid-points of opposite edges of concurrent is

Options

A. `(1,-1,2)`
B. `(-1,1,2)`
C. (1,1,-2)
D. `(-1,1,-2)`

Answer

A

Explanation

We know that line joining the mid-points of opposite edges of tetrahedron are concurrent at point, which is the mean of vertices of tetrahedron. Here it is `(1,-1,2)`