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If A= [{:(-5,1,3),(7,1,-5),(1,-1,1):}]"a...

If A=` [{:(-5,1,3),(7,1,-5),(1,-1,1):}]"and B"=[{:(1,1,2),(3,2,1),(2,1,3):}]`, find the products AB and BA and hence solve the system of equations x+y+2z= 1,3x+2y+z=7, 2x+y+3z=2.

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