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If (3, 3) is a vertex of a triangle and ...

If (3, 3) is a vertex of a triangle and (- 3, 6) and (9,6) are the mid-points of the two sides through this vertex, then the centroid of the triangle is :

A

(3, 7)

B

(1, 7)

C

(-3, 7)

D

(- 1, 7).

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