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Let L be a tangent line to the parabola ...

Let L be a tangent line to the parabola `y^(2)=4x - 20` at (6, 2). If L is also a tangent to the ellipse
`(x^(2))/(2)+(y^(2))/(b)=1`, then the value of b is equal to :

A

20

B

16

C

11

D

14

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