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1)

If the origin and the points P(2,3,4) , Q(1,2,3) and R(x,y,z)  are coplanar, then


A) x-2y-z=0

B) x+-2y+z=0

C) x-2y+z=0

D) 2x-2y+z=0

Answer:

Option C

Explanation:

Let O (0,0,0) be the origin ,

It is given that O(0,0,0) , P(2,3,4), Q(1,2,3) and R(x,y,z) are coplannar

  [OR OP OQ]

[x0y0z0203040102030]=0

   [xyz234123]=0

  x(9-8)-y(6-4)+z(4-3)=0

     x-2y+z=0