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If the system of linear equations x + k y + 3 z = 0 3 x + k y – 2 z = 0 2 x + 4 y – 3 z = 0 has a non-zero solution ( x , y , z ) then 2 y xz is equal to

1. –10
2. 10
3. –30
4. 30

Correct answer: 10

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