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Mathematics, 07.02.2022 14:00 sophiaa23

How do I find the values of a, b and c? (k is 3)B\:=\:\begin{pmatrix}k&1&-1\\ \:\:2&2&1\\ \:\:1&-1&k\end{pmatrix}\:and\:B^{-1}=\begin{pmatrix}a&-\frac{1}{10}&\frac{3}{20}\\ \:b&\frac{1}{2}&-\frac{1}{4}\\ \:c&\frac{1}{5}&\frac{1}{5}\end{pmatrix}

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