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If ax^(2)+2hxy+by^(2)+2gx+2fy+c=0 repres...

If `ax^(2)+2hxy+by^(2)+2gx+2fy+c=0` represents two parallel straight lines, then

A

`h(2)= ab`

B

`bg^(2)= af`

C

`(a)/(h) = (h)/(b)= (g)/(f)`

D

All of these

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The correct Answer is:
D
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