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Mathematics 18 Online
OpenStudy (anonymous):

prove that dertement is equal to zero,where R1=[1/2! 1 O] R2=[1/3! 1/2! 1] R3=[1/4! 1/3! 1/2!]

OpenStudy (valpey):

http://www.youtube.com/watch?v=21LWuY8i6Hw

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