The points with position vectors 60hati+...

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

A

`a= -40`

B

`a=40`

C

`a=20`

D

none of these

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A

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