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?

Category: QuestionsIf 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?
Editor">Editor Staff asked 11 months ago

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
 
The question was asked in an interview for internship.
 
My question comes from Three Dimensional Geometry in portion Three Dimensional Geometry of Mathematics – Class 12
NCERT Solutions for Subject Clas 12 Math Select the correct answer from above options 
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1 Answers
Editor">Editor Staff answered 11 months ago

Right answer is (b) \begin{vmatrix}x_1&y_1&z_1\\x_2&y_2&z_2\\x_3&y_3&z_3\end{vmatrix}=0
 
The explanation: If the three points are collinear, then they will be in a straight line and hence the determinant of the three points will be zero.
 
i.e.\begin{vmatrix}x_1&y_1&z_1\\x_2&y_2&z_2\\x_3&y_3&z_3\end{vmatrix}=0