The values of a so that the vectors a ha...

The values of a so that the vectors a `hati +(a-1) hatj + 3hatk ` and `(a+2) hati +a hatj -2hatk` are perpendicular are

A

`(3)/(2) ,-2`

B

`2, (3)/(2)`

C

`-2, (-3)/(2) `

D

`2, (-3)/(2)`

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The correct Answer is:

A

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