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If the volume of a parallelepiped who...

If the volume of a parallelepiped whose adjacent edges are ` vec a=2 hat i+3 hat j+4 hat k , vec b= hat i+alpha hat j+2 hat k , vec c= hat i+2 hat j+alpha hat k` is 15, then find the value of `alpha` if `(alpha>0)dot`

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The correct Answer is:
`(9)/(2)`
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