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```        The number of distinct real values of  β, for which the vectors
-β2i + j + k , i - β2 j + k and i + j - β2 k are coplanar, is :-

0
1
2
3
```
7 years ago

28 Points
```										Dear Rohit Rastogi,
Ans:- CORRECT ANS IS 2
Let the vectors are a,b,c
As they are coplanar and hence [abc]=0
Solving we get an equation of β which is satisfied by real values of β , iff β²=2
Hence β=+√2 or -√2
Hence 2 values of β are possible.

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All the best Rohit Rastogi !!!

Regards,
```
7 years ago
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