1.

If \(\vec a = \hat i - \hat k,\; \vec b = x\hat i + \hat j + (1 - x)\hat k\) and \(c = y\hat i + x\hat j + (1 + x - y)\hat k,\) then \(\left[\vec a \vec b \vec c\right]\) depends on

A. Neither x nor y
B. Only x
C. Only y
D. Both x and y
Answer» B. Only x


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