1. The problem statement, all variables and given/known data Let A be an m * n matrix with rank m and B be an n * p matrix with rank n. Determine the rank of AB. Justify your answer. 2. Relevant equations 3. The attempt at a solution I don't really know where to start off, but I have some things that might help me. I know that the rank of a matrix is equal to the number of linearly independent rows in it, and I also know that if A and B are two matrices, then rank(AB) <= rank(A) and also rank(AB) <= rank(B). I'm sure if I was given a push in the right direction I could solve this.