9. Given arbitrary matrices A, BE RXn with n> 1, select the c of A and B). 1. tr(AB) = tr(A)tr(B) 2. det(2A) = 2 det(A) 3. tr(AB) = tr(BA) %3D 4. If A and B are invertible, then A+B is invertible 5. rank(AB) < min(rank(A), rank(B))

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