a^2x^2+2xy+9y^2=0 represent a pair of di...

`a^2x^2+2xy+9y^2=0` represent a pair of distinct lines then 'a' lies in

A

`[-1/3, 1/3]`

B

`(-1/3, 1/3)`

C

`[-1/2, 1/2]`

D

`(-1/2, 1/2)`

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The correct Answer is:

B

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