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Trace of a 3×3

EasyLinear Algebra~1m

What is the trace of (512031427)\begin{pmatrix}5&1&2\\0&3&1\\4&2&7\end{pmatrix}?

Show hints (2)+
  1. Trace = sum of the main diagonal.
  2. $5+3+7$.

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Asked at: Optiver, SIG

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