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If the system of linear equations x + y + z = 5 x + 2y + 2z = 6 x + 3y + λ z = μ , ( λ , μ ∈ R), has infinitely many solutions, then the value of λ + μ is :

1. 10
2. 9
3. 12
4. 7

Correct answer: 10

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