KCET 2017 Math Solved Paper

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Question : 50 of 60
 
Marks: +1, -0
If
→
a
,
→
b
,
→
c
‌are
unit vectors such that
→
a
+
→
b
+
→
c
=
→
0
then the value of
→
a
.
→
b
+
→
b
.
→
c
+
→
c
.
→
a
is equal to
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