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OpenStudy (anonymous):
Let A=[5 -4 7 2] [-4 5 -2 -1] [7 -2 17 4] [2 -1 4 1] How many rows of A have a pivot position? Does the equation Ax=b have a solution for each b in R^4? Why or why not? (Note: The one above is a matrix; R is all real numbers)
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