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If a vector 2 hat i + 3 hat j + 8 hat k ...

If a vector `2 hat i + 3 hat j + 8 hat k` is perpendicular to the vector `4 hat j - 4 hat i + alpha hat k` , then the value of `alpha` is

A

`1//2`

B

`-1//2`

C

1

D

`-1`

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