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2. There is a 15 8 matrix A. (a) Please create a new matrix B by extract rows from 3 to 7 and columns from

2. There is a 15 8 matrix A. (a) Please create a new matrix B by extract rows from 3 to 7 and columns from 2 to 5; (b) Please create another new matrix C from A by exchange columns 1 and 3; (c) Please find the second highest value in row 5 (no same element in this row). (d) What are the differences among A(8), A(1,8) and A(8,1)?

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