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If a vertex of a triangle is (1, 1) and ...

If a vertex of a triangle is (1, 1) and the mid-points of two side through this vertex are (-1, 2) and (3, 2), then centroid of the triangle is

A

`(-1/3,7/3)`

B

`(-1,7/3)`

C

`(1/3,7/3)`

D

`(1,7/3)` .

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