If each pair of the following equations ...

If each pair of the following equations `x^2+px+qr=0, x^2+qx+pr=0 and x^2+rx+pq=0 ` has common root, then the product of the three common roots is (A) `2pqr` (B) `pqr` (C) `-pqr` (D) none of these

2pqr

pqr

`-pqr`

none of these

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B, C

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