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The condition that the parabolas y^2=4c(...

The condition that the parabolas `y^2=4c(x-d)` and `y^2=4ax` have a common normal other than X-axis `(agt0,cgt0)` is

A

`2alt2c+d`

B

`2clt2a+d`

C

`2dlt2a+c`

D

`2dlt2c+a`

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The correct Answer is:
A
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