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    Find the determinant and inverse of a matrix whose entries are all '1s' ( ones ) except for the diagonals which are '0s' ( zeros )

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    (1) Let A = (see attachment), the nxn matrix with all entries equal to 1 expect diagonal entries, which are equal to 0. Find the determinant .

    (2) For the above matrix A, find the inverse.

    Please see attachment for complete questions.

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    https://brainmass.com/math/matrices/find-determinant-inverse-matrix-42106

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    Expanding the matrix determinant by minors , I obtain for the nxn matrix D = (-1)^(n+1) x (n-1).
    Try n =3 D =2 ...

    Solution Summary

    The determinant and inverse of a matrix whose entries are all '1s' ( ones ) except for the diagonals which are '0s' ( zeros ) are found. The solution is detailed.

    $2.49

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