Find the least squares solution of each of the following systems: (a) x1 + x2 = 3 2x1 3x2 = 1 0x1 + 0x2 = 2 (b) x1 + x2 = 10 2x1 + x2 = 5 x1 2x2 = 20 (c) x1 + x2 + x3 = 4 x1 + x2 + x3 = 0 x2 + x3 = 1 x1 + x3 = 2

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