If a→, b→, c→ are unit vectors such that a→+b→+c→=0→, th – InterviewSolution

1.	If a→, b→, c→ are unit vectors such that a→+b→+c→=0→, then the value of a→·b→+b→·c→+c→·a→ is(a) 1 (b) 3 (c) -32 (d) none of these
Answer» If $\vec{a}, \vec{b}, \vec{c}$ are unit vectors such that $\vec{a} + \vec{b} + \vec{c} = \vec{0},$ then the value of $\vec{a} \cdot \vec{b} + \vec{b} \cdot \vec{c} + \vec{c} \cdot \vec{a} is$ (a) 1 (b) 3 (c) $- \frac{3}{2}$ (d) none of these

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