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The st line lx+my+n=0 will be a tangent ...

The st line lx+my+n=0 will be a tangent to the parabola `y^(2)=4bx` if

A

`mn=bl^(2)`

B

`ln=bm^(2)`

C

`lm=bn^(2)`

D

`bm=ln^(ln^(2))`

Text Solution

Verified by Experts

The correct Answer is:
B
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