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/1 0 3 2 3 0 0 1 0 0 0 The matrix is not in REF because: 0 10 2 -4 7 0 0

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/1 0 3 2 3 0 0 1 0 0 0 The matrix is not in REF because: 0 10 2 -4 7 0 0 01 -3 -2 O The matrix is actually in REF Not all leading 1's are in the correct places There are too many leadings 1's There are not enough O's above leading 1's There are not enough O's below leading 1's

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