AP EAMCET Engineering 2015 Code C Paper

Section: Mathematics
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Question : 75 of 160
 
Marks: +1, -0
If
−
a
,
−
b
,
−
c
are unit vector such that
−
a
+
−
b
+
−
c
, then
−
a
.
−
b
+
−
b
.
−
c
+
−
c
.
−
a
=
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