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If the roots of x^(3) - 42x^(2) + 336x -...

If the roots of `x^(3) - 42x^(2) + 336x - 512 = 0 `, are in increasing geometric progression, its common ratio is

A

`2:1`

B

`3:1`

C

`4:1`

D

`6:1`

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The correct Answer is:
C
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