IF the points with positon vectors `60hati+3hatj, 40hati-hata8j, ahati-52hatj` are colinear, then prove that `a=-40`

If the points with position vectors 60hati+3hatj, 40 hati-8hatj and a hati - 52 hatj are collinear, then a =

The points with position vectors 60hati+3hatj,40hati-8hatj, 40hati-8hatj,ahati-52hatj are collinear iff (A) a=-40 (B) a=40 (C) a=20 (D) none of these

If the points with position vectors 20 hati + p hatj , 5 hati - hatj and 10 hati - 13 hatj are collinear, then p =

The points with position vectors 10hati+3hatj,12hati-5hatj and ahati+11hatj are collinear, if a is equal to

The points with position vectors 5hati + 5hatk, -4hati + 3hatj - hatk and 2hati +hatj + 3hatk

If the vectors 2hati-hatj+hatk,hati+2hatj-3hatk and 3hati+ahatj+5hatk are coplanar, the prove that a=-4.