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2.82. For what value of A does the following system has a solution: (2x1 x2 +x3 +x4 = 1 | X1+2x2 x3 +4x4 =

2.82. For what value of 1 does the following system has a solution: 2x1 – x2 + x3 + x4 = 1 x1 + 2x2 – X3 + 4x4 = 2 |x1 +7x2 -

2.82. For what value of A does the following system has a solution: (2x1 x2 +x3 +x4 = 1 | X1+2x2 x3 +4x4 = 2 x1 +7x2 - 4x3 +11x4 = A %3D |

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