If \( \left|\begin{array}{ccc}-a^{2} & a b & a c \\ a b &am...

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If \( \left|\begin{array}{ccc}-a^{2} & a b & a c \\ a b & -b^{2} & b c \\ a c & b c & -c^{2}\end{array}\right|=k a^{2} b^{2} c^{2} \), then \( k \) is equal to:
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