If the vertices of a triangle be \[(a,\,1),\ (b,\,3)\]and \[(4,\,c),\]then the centroid of the triangle will lie on x-axis, if

If the vertices of a triangle be \[(a,\,1),\ (b,\,3)\]and \[(4,\,c),\]

1.	If the vertices of a triangle be \[(a,\,1),\ (b,\,3)\]and \[(4,\,c),\]then the centroid of the triangle will lie on x-axis, if
A.	\[a+c=-4\]
B.	\[a+b=-4\]
C.	\[c=-4\]
D.	\[b+c=-4\]
Answer» D. \[b+c=-4\]

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If the vertices of a triangle be \[(a,\,1),\ (b,\,3)\]and \[(4,\,c),\]then the centroid of the triangle will lie on x-axis, if

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