If \(\vec a = \hat i + \hat j + \hat k,\;\vec b= 2\hat i - 4\hat k,\; – McqOptions

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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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