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If veca =2i +4j - 5k, vecb =i + j + k an...

If `veca =2i +4j - 5k, vecb =i + j + k and vecc =j+2k`. Find the unit vector in the opposite direction of `veca+vecb+vecc`

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The correct Answer is:
`(-3veci+6vecj-2veck)/7`
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