AP and TS EAMCET Engineering Model Paper 3

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Question : 38 of 160
 
Marks: +1, -0
The vector
−
a
,
−
b
,
−
c
satisfying the condition
−
a
+
−
b
+2
−
c
=
−
0
.
If |
−
a
|
=1
,
|
−
b
|=4,
|
−
c
|=2
then
−
a
.
−
b
+
−
b
.
−
c
+
−
c
.
−
a
is equals to
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