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ax+by+cz=0, bx+cy+az=0, cx+ay+bz=0 has a...

`ax+by+cz=0, bx+cy+az=0, cx+ay+bz=0` has a non-trivial solution, then the roots of the equation `at^2 + bt +c=0`,are (A) imaginary (B) real and distinct (C) real and of opposite sign (D) real and equal

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