The sum of all value of alpha , for whic...

The sum of all value of `alpha` , for which the points whose position vectors are `hati-2hatj+3hatk , 2hati-3hatj+4hatk , (alpha+1)hati+2hatk` and `9hati+(alpha-8)hatj+6hatk` are coplanar, is equal to

A

4

B

6

C

2

D

-2

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