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KCET 2011 Math Solved Paper

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Question : 20 of 60
 
Marks: +1, -0
If
→
a
,
→
b
 and
→
c
 are unit vectors such that
→
a
+
→
b
+
→
c
=
→
0
 then angle between
→
a
 and
→
b
 is ............................
Validate
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