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vec(a)=hati+2hatj+3hatk and vec(b)=2hati...

`vec(a)=hati+2hatj+3hatk` and `vec(b)=2hati+4hatj-5hatk` are adjacent side of a parallelogram then find the unit vector in the direction of the diagonal of the parallelogram.

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The correct Answer is:
`(1)/(7)(3hati+6hatj-2hatk)`
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