1.

ABCD is a tetrahedron. A_(1), B_(1), C_(1), D_(1) are the centroids of the triangles BCD, ACD, ABD and ABC ,A A_(1), B B_(1), C C_(1), D D_(1) divide one another in the ration :

Answer»

`1:1`
`2:1`
`3:1`
`1:3`

ANSWER :C


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