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The vectors (a,a+1, a+2)(a+3, a+4, a+5)(...

The vectors `(a,a+1, a+2)(a+3, a+4, a+5)(a+6, a+7, a+8)` are coplanar for

A

`AA a in R`

B

`AAa cancel(in)R`

C

`a =- sqrt(-3)`

D

None of these

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A
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