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Previous Year Question (PYQs)
3
Let $\vec a=2\hat i+5\hat j-\hat k$, $\vec b=2\hat i-2\hat j+2\hat k$ and $\vec c$ be three vectors such that $(\vec c+\hat i)\times(\vec a+\vec b+\hat i)=\vec a\times(\vec c+\hat i)$. If $\vec a\cdot\vec c=-29$, then $\vec c\cdot(-2\hat i+\hat j+\hat k)$ is equal to:
Solution
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