Question #11200092

# inverse matrix true or false?

**Which of the following statements are true for all A and B invertible nÃ—n matrices?
1. B is not equal to the zero matrix.
2. A can have two identical rows.
3. AB=I does not imply that BA=I.
4. The system Bv=b has a unique solution for every vector b in â„n.
5. The columns of B span â„n.
**

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