Question:
Mark $(\sqrt{ })$ against the correct answer in each of the following:
If $\vec{a}, \vec{b}$ and $\vec{c}$ are mutually perpendicular unit vectors then $[\vec{a}+\vec{b}+\vec{c}]=$ ?
A. 1
B. $\sqrt{2}$
C. $\sqrt{3}$
D. 2
Solution:
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