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Let a,b,c be three distinct real numbers...

Let a,b,c be three distinct real numbers ,none equal to one . If the vectors `ahati +hat j+hatk, hati +bhatj+hatk` and `hati+hatj+chatk` are coplanar ,then `1/(1-a)+1/(1-b)+1/(1-c)` is equal to

A

`-2`

B

`1`

C

`-1`

D

`2`

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