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If a vector 2 hat (i) + 3 hat(j) + 8 hat...

If a vector `2 hat (i) + 3 hat(j) + 8 hat(k)` is perpendicular to the vector `- 4 hat(i) + 4 hat(j) + alpha(k)`. Then the value of `alpha` is

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The correct Answer is:
`0.5`
`tau=barr xxrarrf=17 hat I -6 hatj-13hatk`
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