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If the roots of $x^3-42 x^2+336 x -512=0,$ are in increasing geometric progression, then its common ratio is
\[(a)\;2 \quad (b)\;3 \quad (c)\;4 \quad (d)\;6 \]
jeemain
eamcet
math
2013
q13
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Sep 14, 2013
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meena.p
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Nov 7, 2013
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