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If veca=2hati-hatj+hatk, vecb=hati+hatj...

If `veca=2hati-hatj+hatk`, `vecb=hati+hatj-2hatk` and `vecc=hati+3hatj-hatk`, find `lambda` such that `veca` is perpendicular to `lambdavecb+vecc`

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Verified by Experts

The correct Answer is:
`lambda=-2`
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