Question: If $\vec{a}, \vec{b}$, and $\vec{c}$ are unit vectors such that $\vec{a}+2 \vec{b}+2 \vec{c}=\overrightarrow{0}$, then $|\vec{a} \times \vec{c}|$ is equal to :
$\frac{1}{4}$
$\frac{\sqrt{15}}{16}$
$\frac{15}{16}$
$\frac{\sqrt{15}}{4}$
Correct Option: , 4
Solution:
Solution not required
