If veca = 2hati - 3hatj + 6hatk and vecb...

If `veca = 2hati - 3hatj + 6hatk and vecb = ahati +hatj+ hatk` are perpendicular to each other, then the value of a is

A

`-3/2`

B

`1/2`

C

`5/2`

D

0

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