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A(3, 1, 5), B(-1, -1, 9) and C(0, -5, 1)...

A(3, 1, 5), B(-1, -1, 9) and C(0, -5, 1) are the vertices of a triangle. Then find the position vector of the centroid of `DeltaABC`.

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The correct Answer is:
`2/3bar(i)-5/3bar(j)+5bar(k)`
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