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if the vectors P = alphahati+alphaj+3hat...

if the vectors `P = alphahati+alphaj+3hatk` and `Q = alphahati - 2 hatj - hatk` are perpendicular to each other, then the positive value of `alpha` is

A

Zero

B

1

C

2

D

3

Text Solution

Verified by Experts

The correct Answer is:
D
`vecA.vecB=a^(2)-2a-3=0rArr(a-3)(a+1)=0`
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