Question

$\hat{n}$ is a vector , $\vec{a}≠0,\vec{b}≠0.$ If $\vec{n}⊥\vec{c},\vec{a}=\alpha\vec{b}-\hat{n}$ and $\vec{b}.\vec{c}$ = 12 then the value of $|\vec{c}\times(\vec{a}\times\vec{b})|$ equals ( where $\hat{n}$ represents unit vector in the direction of $\vec{n}$ )

• A. 144
• B. $\sqrt{12}$
• C. 12
• D. 24

Answer 1

Answer: (C)

12

Answer 2

The correct answer is (C) : 12