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operation Research question A. Given the following: A = (2 _2).B-(2 b).c-(2 1). Find the value of 3BC - 2AB. B. Using the matrix method

operation Research question

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A. Given the following: A = (2 _2).B-(2 b).c-(2 1). Find the value of 3BC - 2AB. B. Using the matrix method or otherwise, solve the following system of simultaneous equations. x + 2y - z = 6 3x + 5y - z = 2 - 2x - y - 2z = 4

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