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Let ` vec a= vec i- vec k , vec b=x vec i+ vec j+(1-x) vec k` and ` vec c=y vec i+x vec j+(1+x-y) vec k` . Then `[ vec a vec b vec c]` depends on (A) only `x` (B) only `y` (C) Neither `x` nor `y` (D) both `x` and `y`

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