Suppose A, B, C are defined as A=a^2b+a ...

Suppose A, B, C are defined as `A=a^2b+a b^2-a^2c-a c^2, B=b^2c+b c^2-a^2b-a b^2, and `
`C=a^2c+a c^2-b^2c-b c^2, w h e r ea > b > c >0` and the equation `A x^2+B x+C=0` has equal roots, then `a ,b ,c` are in `
` `AdotPdot` b. `GdotPdot` c. `HdotPdot` d. `AdotGdotPdot`

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