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 trivial solution, then which of the following is not true? (a) `r_1 != 1` (b) `r_2 != 1` (c) `r_1 != r_2 ` (d) None of these

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