2. If ABC is a triangle with vertices A(1, 1,-1), B(1, 0, 1), and C(1 + a, 0, 2) and AB X AC = (-1, 2, 1), then what is
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2. If ABC is a triangle with vertices A(1, 1,-1), B(1, 0, 1), and C(1 + a, 0, 2) and AB X AC = (-1, 2, 1), then what is
2. If ABC is a triangle with vertices A(1, 1,-1), B(1, 0, 1), and C(1 + a, 0, 2) and AB X AC = (-1, 2, 1), then what is the value of a?
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