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CBSE XII
>>
Math
>>
Vector Algebra
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Q)
If
→
a
,
→
b
,
→
c
are three vectors such that
∣
→
a
+
→
b
+
→
c
∣=
0
and
∣
→
a
∣=
.2
,
∣
→
b
∣=
3
,
∣
→
c
∣=
5
,then value of
→
a
.
→
b
+
→
b
.
→
c
+
→
c
.
→
a
is
(
A
)
0
(
B
)
1
(
C
)
−
19
(
D
)
38
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