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Let the system of linear equations x + y + az = 2 3x + y + z = 4 x + 2z = 1 have a unique solution (x*, y*, z*). If ( α , x*), (y*, α ) and (x*, –y*) are collinear points, then the sum of absolute values of all possible values of α is

1. 4
2. 3
3. 2
4. 1

Correct answer: 2

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