A) \[r.(\hat{i}+\hat{j}+\hat{k})=1\]
B) \[\hat{i}+2\hat{j}+\hat{k}\]
C) \[\hat{i}-2\hat{j}+\hat{k}\]
D) \[-\hat{i}-2\hat{j}+\hat{k}\]
Correct Answer: D
Solution :
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