Х Part 5. Suppose that A is a 20 x 20 matrix for which the following procedure yields I. Start with A. First, swap row,

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Х Part 5. Suppose that A is a 20 x 20 matrix for which the following procedure yields I. Start with A. First, swap row, and row 18. Second, replace row, with row: +5row18. Third, multiply row 16 by 6. Fourth, divide row, by 5. Finally, replace row, with row - 3row.. The result is I. Find det A.