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If the system of linear equations 2 x + 3 y – z = –2 x + y + z = 4 x – y + | λ | z = 4 λ – 4 where λ ∈ R, has no solution, then

1. λ = 7
2. λ = –7
3. λ = 8
4. λ 2 = 1

Correct answer: λ = –7

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