18, where 1, 2, 5. Consider the solutions are there uation 2i Eg + Tg + Tar uovenba (a) if z1, r2, 13 2 0? (b) if r1, #2, 13 2 1? (c) if 0 < 21 < 3, x2 2 0, r3 2 0?

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