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CUET
-- Mathematics - Section B1
Vectors
The two vectors $(\vec a = 2\hat i+\hat j+3\hat k,\,\vec b = 4\hat i-λ\hat j+6\hat k)$ are parallel if $λ$ is equal to:
2
-3
3
-2
$\vec a ||\vec b⇒\vec a=k\vec b$
$\frac{2}{4}=\frac{1}{-λ}=\frac{3}{6}$
$λ=-2$
