Question
$\hat{i} \cdot(\hat{j} \times \hat{k})+\hat{j} \cdot(\hat{i} \times \hat{k})+k \cdot(\hat{i} \times \hat{j})$ का मान है $-$

Answer

$(C)\ 1$
$\hat{i} \cdot(\hat{j} \times \hat{k})+\hat{j} \cdot(\hat{i} \times \hat{k})+k \cdot(\hat{i} \times \hat{j})$
$\Rightarrow \hat{i} \cdot(\hat{i})+\hat{j} \cdot(-\hat{j})+k \cdot(\hat{k})$
$\Rightarrow 1-1+1=1$
अतः सही विकल्प $(C)$ है।

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