[" If "alpha,beta" are roots of equation...

[" If "alpha,beta" are roots of equation "ax^(2)+bx+c=0],[" and "alpha+beta,alpha^(2)+beta^(2),alpha^(3)+beta^(3)" are in G.P.,"],[Delta=b^(2)-4ac," then- "],[[" (1) "Delta b=0," (2) "bc!=0],[" (3) "Delta!=0," (4) "c Delta=0]]

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