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If the system of equations 2x + 3y – z = 0, x + ky – 2z = 0 and 2x – y + z = 0 has a non-trivial solution (x, y, z), then x z z y y x + + + k is equal to :

1. 2 1
2. 4 3
3. 4 1 −
4. –4

Correct answer: 2 1

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