Teaching DSSSB TGT Mock Test 2025 Mathematics Matrices Operations on Matrices

If \(\left| {\begin{array}{*{20}{c}} 2&{2k}&1 \\ 1&{k - 1}&1 \\ 2&1&{k + 1} \end{array}} \right|\, = \,A{k^2}\, + \,Bk\, + \,C\), then A + B + C =

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