1.

Let  \[\overrightarrow{A}=i+j+k\], \[\overrightarrow{B}=i,\,\overrightarrow{C}={{C}_{1}}i+{{C}_{2}}j+{{C}_{3}}k\]. If \[{{C}_{2}}=-1\], and \[{{C}_{3}}=1\], then to make three vectors coplanar         [AMU 2000]

A.             \[{{C}_{1}}=0\]
B.             \[{{C}_{1}}=1\]
C.             \[{{C}_{1}}=2\]
D.             No value of \[{{C}_{1}}\] can be found
Answer» E.


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