1.

The sum of the distinct real values of μ, for which the vectors, \({\rm{\mu }}\hat i + \hat j + \hat k,\;\hat i + {\rm{\mu }}\hat j + \hat k,\;\hat i + \hat j + {\rm{\mu }}\hat k\) are coplanar, is

A. 2
B. 0
C. 1
D. -1
Answer» E.


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