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If the points (k , 2k) , (3 k , 3k ) and...

If the points (k , 2k) , (3 k , 3k ) and (3 , 1) are collinear . Then k is

A

`(1)/(3)`

B

`(-1)/(3)`

C

`(2)/(3)`

D

`(-2)/(3)`

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