1.

If \(\vec a = \hat i + \hat j + \hat k,\;\vec b= 2\hat i - 4\hat k,\;\vec c=\hat i + λ \hat j + 3\hat k\) are coplanar, then the value of λ is:

A. 5/2
B. 3/5
C. 7/3
D. 5/3
Answer» E.


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