If the centroid of the triangle formed by the points (3,-5),(-7,4),(10,-k) is at the point (k, -1...

If the centroid of the triangle formed by the points (3,-5),(-7,4),(10,-k) is at the point (k, -1 ), then k=
(a) 3
(b) 1
(c) 2
(d) 4
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