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If $(- 3, 0, 3)$ is a centroid of a triangle for which $(3, - 9, 11)$ , $(- 2, 5, 7)$ are two vertices , then third vertex

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$(1, 2, 9)$

$(- 10, 4, - 9)$

$(- 1, - 5, - 2)$

$(1, 3, - 1)$

answer is B.

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Detailed Solution

$3 G = A + B + C$

where A(3,-9,11)B(-2,5,7)C(x,y,z) andG(-3,0,3)
(-9,0,9)=(3-2+x,-9+5+y,11+7+z)

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