Question

In a tetrahedron ABCD is A=(1,-2,5) and
the centroid of the triangle BCD is
(3, 2, -4) then the centroid of the
tetrahedron is
1) (7/3, 2/3,-1) 2) (5/4, 1/2, -7/4)
3) (5/2, 1, -774) 4) (5, 2, -7/2)​

Answer 1

2-1 0 that means answer is 57