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A (3, 2, -1), B (4, 1, 1), C(6, 2, 5) ar...

A `(3, 2, -1), B (4, 1, 1), C(6, 2, 5)` are three points. If D, E, F are three points which divide BC, CA, AB respectively in the same ratio `2 : 1` then the centroid of `Delta DEF` is

A

`(13/3, 5/3 , 5/3)`

B

`(13, 5, 5)`

C

`(4, 2, 1)`

D

`(11/3, 4/3 , 1/3)`

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A
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