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Easy · Mental Math & Estimation · Quant Trader interview question · linear-algebra, matrix, determinant, mental-math
You are a market maker quoting a complex financial instrument. To price it accurately, you need to quickly calculate the determinant of a matrix representing the correlations between different underlying assets. Given the following matrix: $\begin{pmatrix} 2 & 5 & 1 \\ 0 & 3 & 4 \\ 0 & 0 & 5 \end{pmatrix}$ What is its determinant?