If (1, a), (3, 9a), (4, b), (6, 18) are ...

If (1, a), (3, 9a), (4, b), (6, 18) are collinear, then `(a, (b)/(a))=`

A

(6, 13)

B

`((6)/(7), 13)`

C

`((6)/(7), (13)/(7))`

D

`(21, 13)`

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The correct Answer is:

B

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