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Let p, q, r be distinct positive numbers...

Let `p, q, r` be distinct positive numbers. Three lines `p x+q y+r=0, q x+r y+p=0` and `r x+p y+q=0` are concurrent, if

A

`p+q+r=0`

B

`p^(2)+q^(2)+r^(2)=p q+q r+r p`

C

`p^(3)+q^(3)+r^(3)=3 p q r`

D

none of these

Text Solution

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The correct Answer is:
C
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