If alpha, beta are the roots of ax^(2) +...

If `alpha, beta` are the roots of `ax^(2) +bx+c=0 and alpha + beta, alpha^(2)+beta^(2) , alpha^(3)+beta^(3)` are in G.P., then

A

`Delta ne 0`

B

`b Delta =o`

C

`c b ne 0`

D

`c Delta =0`

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The correct Answer is:

D

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