NDA Math Vector Algebra

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For the next four (04) items that follow:
a
+
b
+
c
=
0
and |
a
|
=3
,
|
b
|=5
and |
c
|
=7
[NDA II 2014]
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Question : 95 of 101
 
Marks: +1, -0
What is
a
.
b
+
b
.
c
+
c
.
a
equal to ?
[NDA II 2014]
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