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Examine the following vector for linea...

Examine the following vector for linear independence:
(1) `vec i+vec j+vec k ,2vec i+3vec j-veck,-vec i-2vecj+2vec k`
(2) `3veci+vec j-vec k, 2vec i-vec j+7 vec k, 7 veci-vec j+13vec k`

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