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Find vectors a.(b x c), if a = 2i + j + 3k, b = -i + 2j + k and c = 3i + j + 2k.

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\(\vec a.(\vec b\times\vec c)= \begin{vmatrix} 2 & 1& 3\\ -1& 2& 1\\ 3& 1& 2 \end{vmatrix}\) = -10

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