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The system of linear equations , and has a unique solution if:
The system of linear equations $x + y + z = 6$, $x + \lambda y + 2z = 7$ and $3x + y + z = 12$ has a unique solution if:
- a$\lambda = 2$
- b$\lambda \neq 2$
- c$\lambda = -2$
- d$\lambda \neq -2$
Answer
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From ISC 2026 Improvement Mathematics Paper 1, question 1(x).