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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

\[(a)\;2 \quad (b)\;3 \quad (c)\;4 \quad (d)\;6 \]
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1 Answer

(c) 4
answered Nov 7, 2013 by pady_1
 

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