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Three lines px+qy+r=0, qx+ry+p=0 and rx+...

Three lines `px+qy+r=0`, `qx+ry+p=0` and `rx+py+q=0` are concurrent , if

A

`Sigmaa^(3)=3abc`

B

`sigmaa=0`

C

`Sigmaa^(2)=Sigmaab`

D

None

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A, B, C, D
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