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Byju's Answer
Standard XII
Mathematics
Dot Product
Show that the...
Question
Show that the points
A
(
−
2
^
i
+
3
^
j
+
5
^
k
)
,
B
(
^
i
+
2
^
j
+
3
^
k
)
and
C
(
7
^
i
−
^
k
)
are collinear.
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Solution
A
(
−
2
,
3
,
5
)
B
(
1
,
2
,
3
)
C
(
7
,
0
,
−
1
)
−
−
→
A
B
=
(
3
,
−
1
,
−
2
)
−
−
→
A
C
=
(
9
,
−
3
,
−
6
)
−
−
→
A
C
=
3
−
−
→
A
B
I
m
p
l
i
e
s
A
,
B
a
n
d
C
a
r
e
c
o
l
l
i
n
e
a
r
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0
Similar questions
Q.
The points A, B and C with position vectors
−
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3
^
j
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,
^
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^
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a
n
d
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^
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respectively are non collinear.
Q.
The points A, B and C with position vectors
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respectively are non collinear.
Q.
The ratio in which
^
i
+
2
^
j
+
3
^
k
divides the join of
−
2
^
i
+
3
^
j
+
5
^
k
and
7
^
i
−
^
k
is
Q.
If
→
r
=
3
^
i
+
2
^
j
−
5
^
k
,
→
a
=
2
^
i
−
^
j
+
^
k
,
→
b
=
^
i
+
3
^
j
−
2
^
k
and
→
c
=
−
2
^
i
+
^
j
−
3
^
k
such that
→
r
=
x
→
a
+
y
→
b
+
z
→
c
, then
Q.
If
→
r
=
3
^
i
+
2
^
j
−
5
^
k
,
→
a
=
2
^
i
−
^
j
+
^
k
,
→
b
=
^
i
+
3
^
j
−
2
^
k
and
→
c
=
−
2
^
i
+
^
j
−
3
^
k
such that
→
r
=
l
→
a
+
m
→
b
+
n
→
c
, then
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