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The points with position vectors 60 i...

The points with position vectors `60 i+3j ,40 i-8j ,a i-52 j` 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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The correct Answer is:
A
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