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Which one of the following is the equati...

Which one of the following is the equation whose roots are respectively three times the roots of the equation `ax^2+bx+c=0` a)`ax^2+3bx+c=0` b)`ax^2+3bx+9c=0` c) `ax^2-3bx+9c=0` d)`ax^2+bx+3c=0`

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