Mark (√) against the correct answer in the following:
If 
and 
are mutually perpendicular unit vectors then 
Given vectors 
and 
Also given 
As they are perpendicular,
=0
⇒ (
).(
⇒ (3 
1) + (1
) + (-2 
-3) =0
⇒ 3+
+6=0
⇒ 
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