I'm calculating the determinant of the matrix below. However the right answer is $-15$, but I'm getting $-30$. Can someone please point out the mistake?
2026-04-25 12:10:10.1777119010
Determinant of a matrix
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[Don't upvote - just a summary of answers in comments so question not unanswered forever]
The problem was a step doubling a row, which is not an elementary row operation. This changed the determinant.