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Problem 459. Sum of diagonal of a square matrix

If

 x = [1 2 4; 3 4 5; 5 6 7]

then y should be the sum of the diagonals of the matrix

 y = 1 + 4 + 7 = 12
Solve

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71.3% Correct | 28.7% Incorrect
Last solution submitted on Aug 21, 2019

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