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IIT JEE Advanced 2009 Paper 1

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Question : 42

Total: 60

If

are unit vectors such that (

, then

→
a
,
→
b
,
→
c
are non-coplanar.
→
b
,
→
c
,
→
d
are non-coplanar.
→
b
,
→
d
are non-parallel.
→
a
,
→
d
are parallel and
→
b
,
→
c
are parallel.

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