1.

If a, b, c, d are unit vectors such that (axb).(cxd)=1 and a.c=1/2 then a) a, b, c are non-coplanar , b) b, c, d are non-coplanar , c) b, d are non-parallel , d) a, dare parallel and b, c are parallel .

Answer»
If a, b, c, d are unit vectors such that (axb).(cxd)=1 and a.c=1/2 then
a) a, b, c are non-coplanar
,
b) b, c, d are non-coplanar
,
c) b, d are non-parallel
,
d) a, dare parallel and b, c are parallel
.


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