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The points A(3, 6) and B lie on the para...

The points A(3, 6) and B lie on the parabola `y^(2)=4ax`, such that the chord AB subtends `90^(@)` at the origin, then the length of the chord AB is equal to

A

`15sqrt(13)" units"`

B

`12sqrt(17)" units"`

C

`9sqrt(17)" units"`

D

`9sqrt(10)" units"`

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The correct Answer is:
A
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