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Byju's Answer
Standard XII
Mathematics
Addition of Vectors
The position ...
Question
The position vectors of
A
,
B
,
C
,
D
are
→
a
,
→
b
,
2
→
a
+
3
→
b
and
→
a
−
2
→
b
respectively. Show that
−
−
→
D
B
=
3
→
b
−
→
a
and
−
−
→
A
C
=
→
a
+
3
→
b
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Solution
→
O
A
=
→
a
→
O
B
=
→
b
→
O
C
=
2
→
a
+
3
→
b
→
O
D
=
→
a
−
2
→
b
→
D
B
=
→
O
B
−
→
O
D
=
→
b
−
(
→
a
−
2
→
b
)
=
3
→
b
−
→
a
→
A
C
=
→
O
C
−
→
O
A
=
(
2
→
a
+
3
→
b
)
−
(
→
a
)
=
→
a
+
3
→
b
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Similar questions
Q.
If the position vectors of A, B, C, D are
→
a
,
→
b
.
2
→
a
+
3
→
b
,
→
a
−
2
→
b
respectively, then
→
A
C
,
→
D
B
,
→
B
A
,
→
D
A
are?
Q.
Four points given by position vectors
2
→
a
+
3
→
b
−
→
c
,
→
a
−
2
→
b
+
3
→
c
,
3
→
a
+
4
→
b
−
2
→
c
a
n
d
→
a
−
6
→
b
+
6
→
c
are coplanar, where
→
a
,
→
b
a
n
d
→
c
are non-coplanar vectors.
Q.
If
→
a
a
n
d
→
b
are non-zero vectors such that
|
→
a
−
3
→
b
|
=
|
→
a
+
3
→
b
|
, then the angle between
→
a
a
n
d
→
b
is
Q.
Examine whether following vectors are coplanar or not.
→
a
+
→
b
−
2
→
c
,
→
a
−
3
→
b
+
→
c
and
2
→
a
−
→
b
−
→
c
.
Q.
If
→
A
=
(
→
a
−
2
→
b
+
3
→
c
)
→
B
=
(
−
2
→
a
+
3
→
b
+
2
→
c
)
→
C
=
(
−
8
→
a
+
13
→
b
)
Then
→
A
B
and
→
A
C
are collinear
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