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The condition that one root of px^(2)+qx...

The condition that one root of `px^(2)+qx+r=0` may be double of the other is

A

`q ^(2) = 9 rp`

B

`2q ^(2) = 9 rp`

C

`q ^(2) = rp`

D

None of these

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The correct Answer is:
B
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