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UPSC NDA Math Model Paper 2

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Question : 13 of 120
 
Marks: +1, -0
Let
→
a
,
→
b
,
→
c
 be vector such that |
→
a
|=2,|
→
b
|=3,|
→
c
|=5 and
→
a
+
→
b
+
→
c
=0. The value of
→
a
.
→
b
+
→
b
.
→
c
+
→
c
.
→
a
 is?
Validate
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