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

21. If a vertex of a triangle is (1, 1) and the midpoints of two sides of the triangle through this vertex are (-1, 2) and (3, 2), then the 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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