Question: Please solve ONLY qus 3. 3. Let A c Roxx be invertible, i.e., A- exists. Let also rank(A) = n. What is rank(A-1)? 4. What
Please solve ONLY qus 3.

3. Let A c Roxx be invertible, i.e., A- exists. Let also rank(A) = n. What is rank(A-1)? 4. What conditions must a and b obey in order to make all vectors u = (uj up us) , such
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