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If a ,b ,c are in G.P. with common ratio...

If `a ,b ,c` are in G.P. with common ratio `r_1a n dalpha,beta,gamma` are in G.P. with common ratio `r_2` and equations `a x+alphay+z=0,b x+betay+z=0,c x+gammay+z=0` have only zero solution, then which of the following is not true? `a+b+c` b. `a b c` c.`1` d. none of these

A

`r_(1) ne `1

B

`r_(2) ne 1 `

C

`r_(1) ne r_(2)`

D

None of these

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The correct Answer is:
D
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