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KCET 2013 Math Solved Paper

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Question : 28 of 60
 
Marks: +1, -0
If
→
a
,
→
b
,
→
c
 are unit vectors such that
→
a
+
→
b
+
→
c
=0,then
→
a
.
→
b
+
→
b
.
→
c
+
→
c
.
→
a
=_____
Validate
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