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If veca = hati + 2 hatj + 3 hatk, vecb=-...

If `veca = hati + 2 hatj + 3 hatk, vecb=- hati + 2 hatj + hatk and vec c = 3 hati + hatj,` then th such that `vec a + t vecb ` is at right angles to `vec c,` will be equal to :

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The correct Answer is:
`lamda=8`
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