1.

If the centroid of the triangle with vertices (3c+2,2,0),(2c,-1,-1)and(c+2,3c+1,c+3) lies in the plane z=c, then the coordinates of the centroid are:

Answer»

`(-(2)/(3),-(1)/(3),(1)/(3))`
`((10)/(3),(5)/(3),1)`
`((4)/(3),(2)/(3),(2)/(3))`
`((2)/(3),(1)/(3),-(1)/(3))`

Answer :B


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