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Question 1
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The value of $\lambda$ for which the volume of the parallelepiped formed by the vectors $\vec i+\lambda\vec j+\vec k,\ \vec j+\lambda\vec k,\ \lambda\vec i+\vec k$ is minimum is
A.
$-3$
B.
$3$
C.
$\dfrac1{\sqrt3}$
D.
$-\sqrt3$
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