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Deduce the condition for the vectors 2ha...

Deduce the condition for the vectors `2hati + 3hatj - 4hatk and 3hati - alpha hatj + bhatk` to be parallel.

A

`a=-9//2,b=-6`

B

`a=-6,b=-9//2`

C

`a=4,b=5`

D

`a=8,b=2`

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The correct Answer is:
A
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