\left| \begin{array}{ccc}{1+a} & {1} & {1} \\ {1} & {1+b} & {1} \\ {1} – InterviewSolution

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1.	\left\| \begin{array}{ccc}{1+a} & {1} & {1} \\ {1} & {1+b} & {1} \\ {1} & {1} & {1+c}\end{array}\right\|=a b c\left(1+\frac{1}{a}+\frac{1}{b}+\frac{1}{c}\right)
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