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If every pair from among the equations `x^2+px+qr=0,x^2+qx+rp=0` and `x^2+rx+pq=0` has a common root, then the sum of the three common roots is

A

`(sumP)/(pqr)`

B

`sum(1)/(pq)`

C

`(p+a+r)^(2)`

D

none of these

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