Answer :

Since, centroid of a triangle is found by


The points are A(a,1,3) and B(-2, b, -5), and its centroid is (0, 0, 0) and its third vertex C(4,7,c).


Using the formula, we get




Equating it with the coordinates of centroid, we get



a = -2



b = -8


and,


c = 2


therefore, a= -2, b= -8, c=2.


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