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Exercise_4 - THE CHINESE UNIVERSITY OF HONG KONG Department...

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THE CHINESE UNIVERSITY OF HONG KONG Department of Mathematics MAT2310 Linear Algebra and Applications (Fall 2007) Solution of Exercise 4 (In Class) Let A = 1 - 1 2 3 1 1 2 - 1 3 1. Find the determinant of A expanding by cofactors of the third row. 2. Find the determinant of A expanding by cofactors of the second column. Solution: 1. 2 × ( - 1) 3+1 × fl fl fl fl - 1 2
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