A) 3
B) 2
C) 1
D) 0
Correct Answer: A
Solution :
\[\mathbf{p}+\mathbf{q}+\mathbf{r}=\frac{\mathbf{b}\times \mathbf{c}+\mathbf{c}\times \mathbf{a}+\mathbf{a}\times \mathbf{b}}{[\mathbf{a}\,\mathbf{b}\,\mathbf{c}]}\] \[(\mathbf{a}+\mathbf{b}+\mathbf{c})\,.\,(\mathbf{p}+\mathbf{q}+\mathbf{r})=\frac{[\mathbf{a}\,\mathbf{b}\,\mathbf{c}]+[\mathbf{b}\,\mathbf{c}\,\mathbf{a}]+[\mathbf{c}\,\mathbf{a}\,\mathbf{b}]}{[\mathbf{a}\,\mathbf{b}\,\mathbf{c}]}=3\].You need to login to perform this action.
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