1.

If r a=r. b=r. c=1 where a, b, c are any three non-coplanar vectors, then r is

Answer»

coplanar with a, b, c
PARALLEL to `a+b+c`
parallel to `b XX c+c xx a+axxb`
parallel to `(a xx b) xx c`

SOLUTION :Now,l `r*a=r*b`
`implies r((a-b)=0`
Similarly, `r*(b-c)=0`
Since, r is parallel to `(a-b)xx(b-c).`
So, r is parallel to `axx b +c xx a +b xx c`


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