KCET 2010 Math Solved Paper

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Question : 35 of 60
 
Marks: +1, -0
If
→
a
,
→
b
and
→
c
are unit vectors, such that
→
a
+
→
b
+
→
c
=
→
0
, then 3
→
a
â‹…
→
b
+2
→
b
â‹…
→
c
+
→
c
â‹…
→
a
=

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