Prove that if A, B, and C are n × n non-singular matrices, then (ABC)^-1 = C^−1B^−1A^−1 .
"(ABC)^{-1}=[(AB)C]^{-1}=C^{-1}(AB)^{-1}=C^{-1}B^{-1}A^{-1}"
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