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Let a,b,c be three non-coplanar vectors ...

Let a,b,c be three non-coplanar vectors and r be any vector in space such that `r.a =1, r.b =2 and r.c = 3`. If [abc] = 1, then r is equal to :

A

`(b.c) a + 2 (c.a) b + 3(a.b)c`

B

`(b xxc) + 2 (c xx a) + 3 (a xx b)`

C

`a +2b + 3c`

D

none

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The correct Answer is:
B
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