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If the lines (p-q)x^2+2(p+q)xy+(q-p)y^2=...

If the lines `(p-q)x^2+2(p+q)xy+(q-p)y^2=0` are mutually perpendicular , then

A

`p=q`

B

`q=0`

C

`p=0`

D

p and q may have any value

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The correct Answer is:
D
NA
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