Why is the determinant of the all one matrix minus the identity matrix n-1? – math.stackexchange.com

Why is the determinant of the all one matrix minus the identity matrix n-1? – math.stackexchange.com

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Context (skippable) I was asked (by a friend who is preparing for an exam) whether there was a special trick to compute the determinant of the following matrix. I didn't see anything beyond using the ...

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