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The system of equations –kx + 3y – 14z = 25 –15x + 4y – kz = 3 –4x + y + 3z = 4 is consistent for all k in the set

1. R
2. R – {–11, 13}
3. R – {13}
4. R – {–11, 11}

Correct answer: R – {–11, 11}

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