IIT JEE 2009 P1 Q28

if a, b, c, d are unit vectors such that (axb).(cxd)=1 and a.c=1/2

then

A) a,b, care non coplanar
B) b,c,d are non coplanar
D) b,d are non parallel
D) a,d are parallel and b,c are parallel..

2 Answers

[url=http://iitjee2009solutions.targetiit.com]Solution Key with Question Paper of 2009 IIT JEE[/url]

Tell me this is C[32]

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