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A focal chord of y^(2)=4ax meets it in ...

A focal chord of `y^(2)=4ax` meets it in P and Q. If S is the focus, then `(1)/(SP)+(1)/(SQ)=`

A

`(1)/(a)`

B

`(4)/(a)`

C

`(2)/(a)`

D

None of these.

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A
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