By applying row operations to produce an upper triangular U, compute det 1 2 3 0 2 6 6 1
Chapter 4, Problem 4.2.23(choose chapter or problem)
By applying row operations to produce an upper triangular U, compute det 1 2 3 0 2 6 6 1 1 0 0 3 0 2 0 7 and det 2 1 1 1 1 2 1 1 1 1 2 1 1 1 1 2
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