vectors

Question: The vector $\overrightarrow P = a\hat i + a\hat j + 3\hat k$ and $\overrightarrow Q = a\hat i - 2\hat j - \hat k$ are perpendicular to each other. The positive value of a is



1) 3
2) 4
3) 9
4) 13
Solution: Explanation: explanation
multiplication-of-vectors

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