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y=3x is tangent to the parabola 2y=ax^2+...

`y=3x` is tangent to the parabola `2y=ax^2+ab`.
If b=36, then the point of contact is

A

(a) (1,3)

B

(b) (2,6)

C

(c) (3,9)

D

(d) (6,18)

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The correct Answer is:
D
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