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				| 1. | If the plane passes through three collinear points \((x_1,y_1,z_1),(x_2,y_2,z_2),(x_3,y_3,z_3)\) then which of the following is true? | 
| A. | \(x_1 y_1 z_1+x_2 y_2 z_2+x_3 y_3 z_3\)=0 | 
| B. | \(\begin{vmatrix}x_1&y_1&z_1\\x_2&y_2&z_2\\x_3&y_3&z_3\end{vmatrix}\)=0 | 
| C. | \(\begin{vmatrix}x_1\\y_2\\z_3\end{vmatrix}\)=0 | 
| D. | \(x_1 x_2 x_3+y_1 y_2 y_3+z_1 z_2 z_3=0\) | 
| Answer» C. | |