Eigenvalues & Eigenvectorshard
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Let AA be a 4×44 \times 4 real symmetric matrix with eigenvalues 2,1,3,5-2, 1, 3, 5. Let BB be a 3×33 \times 3 principal submatrix of AA (formed by deleting one row and its corresponding column). Which of the following could be the eigenvalues of BB?