If every pair of the equations\[{{x}^{2}}+px+qr=0\], \[{{x}^{2}}+qx+rp=0,\] \[{{x}^{2}}+rx+pq=0\] have a common root, then the sum of three common roots is

If every pair of the equations\[{{x}^{2}}+px+qr=0\], \[{{x}^{2}}+qx+rp

1.	If every pair of the equations\[{{x}^{2}}+px+qr=0\], \[{{x}^{2}}+qx+rp=0,\] \[{{x}^{2}}+rx+pq=0\] have a common root, then the sum of three common roots is
A.	\[\frac{-(p+q+r)}{2}\]
B.	\[\frac{-p+q+r}{2}\]
C.	\[-(p+q+r)\]
D.	\[-p+q+r\]
Answer» B. \[\frac{-p+q+r}{2}\]

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If every pair of the equations\[{{x}^{2}}+px+qr=0\], \[{{x}^{2}}+qx+rp=0,\] \[{{x}^{2}}+rx+pq=0\] have a common root, then the sum of three common roots is

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