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Vector Algebra - JEE Mathematics question (JEE Main 2014 (Offline))

JEE Main 2014 (Offline)Question 1
If $\left[\vec a\times\vec b\ \ \vec b\times\vec c\ \ \vec c\times\vec a\right]=\lambda\left[\vec a\ \ \vec b\ \ \vec c\right]^{2}$ then $\lambda$ is equal to :
Vector Algebra
Options for question 1, choose one

Solution

$[\vec a\times\vec b\ \vec b\times\vec c\ \vec c\times\vec a]=[\vec a\ \vec b\ \vec c]^2$, so $\lambda=1$.

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