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A point an the parabola y^(2)=18x at whi...

A point an the parabola `y^(2)=18x` at which the ordinate increases at twice the rate of the abscissa is :

A

(2,4)

B

(2, -4)

C

(-9/8,9/2)

D

(9/8,9/2)

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The correct Answer is:
D
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