MCQ
सदिश $\lambda \hat{i}+\hat{j}+2 \hat{k}, \hat{i}+\lambda \hat{j}-\hat{k}$ और $2 \hat{i}-\hat{j}+\lambda \hat{k}$ समतलीय हैं यदि
- ✓$\lambda=-2$
- B$\lambda=0$
- C$\lambda=1$
- D$\lambda=-1$
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