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If r a=r. b=r. c=1 where a, b, c are any three non-coplanar vectors, then r is |
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Answer» coplanar with a, b, c `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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