1.

If the value of the determinant \[\left| \begin{matrix}    a & 1 & 1  \\    1 & b & 1  \\    1 & 1 & c  \\ \end{matrix} \right|\] is positive, where \[a\ne b\ne c,\] then the value of abc

A. Cannot be less than 1
B. Is greater than \[-8\]
C. Is less than \[-8\]
D. Must be greater than 8
Answer» C. Is less than \[-8\]


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