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- December 15th 2008, 12:28 AM #1

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- December 15th 2008, 02:24 AM #2

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- December 15th 2008, 02:28 AM #3
a) You should know that .

b) See theorem 1 here: Pauls Online Notes : Linear Algebra - Properties of Determinants

c) Consider theorem 3 here: Pauls Online Notes : Linear Algebra - Properties of Determinants