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Question : 30 of 39

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Find the quadratic equation Sum of whose roots is 3 and the Sum of the cubes of roots is 7

$9 x^{2}-27 x+20=20$
$21 x^{2}+147 x+20=0$
$21 x^{2}-147 x+20=0$
$-21 x^{2}-147 x+20=0$

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