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Unless otherwise specified, assume that all matrices in these ex- ercises are n x n. Determine which of the matrices in Exercises 1-10 are invertible.

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Unless otherwise specified, assume that all matrices in these ex- ercises are n x n. Determine which of the matrices in Exercises 1-10 are invertible. Use as few calculations as possible. Justify your answers. u 1. 2. 4 6 -7 3. LOO 4. NOW 5. A - O 6. WO - a w in Lhak bow uve NWL NO - 7. N WOOD 8. ONON OOUD DOO

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