Solve this following
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 :

 

  1. $\frac{1}{4}$

  2. $\frac{\sqrt{15}}{16}$

  3. $\frac{15}{16}$

  4. $\frac{\sqrt{15}}{4}$


Correct Option: , 4

Solution:

Solution not required

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