Spectrum of a triangular matrix

What is the largest eigenvalue of (321054007)\begin{pmatrix} 3 & 2 & 1 \\ 0 & 5 & 4 \\ 0 & 0 & 7 \end{pmatrix}?

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  1. Eigenvalues of a triangular matrix sit on the diagonal.

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7

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Asked at: Jane Street, Two Sigma

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