# Exercise Solution 3.20

- The correlation matrix has determinant |
**ρ**| = 0.00000, so it is singular. - The correlation matrix has determinant |
**ρ**| = 0.00079, so it is multicollinear. - The correlation matrix has determinant |
**ρ**| = 0.65230, so it is neither singular nor multicollinear.

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