1)

If a,b and c are three non-collinear points and ka+2b+3c is a point in the plane of a,b, c then k=


A) 4

B) 5

C) -5

D) -4

Answer:

Option C

Explanation:

a,b, and c are three non-collinear point and ka+2b+3c is a point in the plane a,b, c  

     ka+2b+3c=0

     k+2+3=0    k=-5