Answer :



Mid-points of sides of ΔABC are D( 1, 2, -3), E(3, 0, 1) and F(-1, 1, -4).

From basic geometry we know that, centroid of Δ ABC and Δ DEF will be the same.

centroid of Δ ABC is given by

Hence, centroid of ΔABC is = (1, 1, -2)

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