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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 (2,6) is the point of contact , then the value of 2a is

A

(a) 2

B

(b) 3

C

(c) 4

D

(d) 5

Text Solution

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The correct Answer is:
B
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