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What is the condition for the vectors 2i...

What is the condition for the vectors `2i + 3j - 4k and 3i - aj + bk` 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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A
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