Compute the sum of all the columns of a matrix, MATLAB Programming

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1. Enter the 3×4 matrix

144_Compute the Sum of all the Columns of a Matrix.png

Let a_ij denote the entry of A in the ith row and jth column.

Use Matlab to compute the following :

(a) a₁₃ + a₃₂

(b) Three times the 3rd column of A

(d) The sum of all the columns of A

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