If |a|=5,|b|=3,|c|=4 and a is perpendicular to b and c such that … - Vidyadip

MCQ

If $|\vec{a}|=5,|\vec{b}|=3,|\vec{c}|=4$ and $\vec{a}$ is perpendicular to $\vec{b}$ and $\vec{c}$ such that angle between $\vec{b}$ and $\vec{c}$ is $\frac{5 \pi}{6}$, then $[\vec{a} \vec{b} \vec{c}]=$

A
20
✓
30
C
12
D
25

✓

Answer

Correct option: B.

30

(b) 30

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