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Byju's Answer
Standard XII
Mathematics
Equation of a Line Passing through 2 Points
Let G be th...
Question
Let
G
be the centroid of
â–³
A
B
C
.
If
−
−
→
A
B
=
→
a
and
−
−
→
A
C
=
→
b
,
then
−
−
→
A
G
, in terms of
→
a
and
→
b
is
A
2
3
(
→
a
+
→
b
)
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B
1
6
(
→
a
+
→
b
)
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C
1
3
(
→
a
+
→
b
)
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D
1
2
(
→
a
+
→
b
)
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Solution
The correct option is
D
1
3
(
→
a
+
→
b
)
Let
A
be the origin.
then
−
−
→
A
B
=
→
a
,
−
−
→
A
C
=
→
b
implies that the position vectors of
B
and
C
are
→
b
and
→
c
respectively.
Let
A
D
be the median and
G
be the centroid. Then,
P
.
V
.
of
D
=
→
a
+
→
b
2
,
P
.
V
.
of
G
=
→
a
+
→
b
3
∴
−
−
→
A
G
=
→
a
+
→
b
3
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Q.
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B
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Q.
Let G be the centroid of ∆ ABC. If
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2
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a
3
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.
.
,
|
a
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<
1
y
=
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+
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b
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Find S = 1 + 3 (ab) + 5 (ab)^2 + .......
in terms of x and y
Q.
If the point
(
a
3
(
a
−
1
)
,
a
2
−
3
(
a
−
1
)
)
,
(
b
3
(
b
−
1
)
,
b
2
−
3
(
b
−
1
)
)
and
(
c
3
(
c
−
1
)
,
c
2
−
3
(
c
−
1
)
)
are collinear for three distinct values
a
,
b
,
c
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a
≠
1
,
b
≠
1
and
c
≠
1
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a
b
c
−
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b
+
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c
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)
+
3
(
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+
b
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