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If one of the roots of the equation px^(...

If one of the roots of the equation `px^(2)+qx+r=0` is three times the other, then which one of the following relations is correct ?

A

`3q^(2)=16 pr`

B

`q^(2)=24 pr`

C

`p=q+r`

D

`p+q+r=1`

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