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Which one of the following is wrong? (A)...

Which one of the following is wrong? (A) The elements on the main diagonal of a symmetric matrix are all zero (B) The elements on the main diagonal of a skew - symmetric matrix are all zero (C) For any square matrix A, `A A^'` is symmetric (D) For any square matrix A, `(A + A^')^2 =A^2+ (A^') + 2A A^'`

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