If
Then what is the product of AB?
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1. Find a 2x2 matrix A with no entry =0 that has A^2=0
2. Find a 2x2 matrices A,B with (AB)^t does not equal A^tB^t
3. Let A and B be nxn and upper triangular. Then AB is upperTriangular
4. Find square matrices A and B so that the diagonal of AB hasno entries in common with the diagonal of BA