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Standard X
Mathematics
Question
If
x
=
∑
∞
n
=
0
a
n
,
y
=
∑
∞
n
=
0
b
n
,
z
=
∑
∞
n
=
0
c
n
where a, b, c are in AP and
|
a
|
<
1
,
|
b
|
<
1
,
|
c
|
<
1
then x, y, z are in:
Open in App
Solution
Verified by Toppr
All three are sum of infinite G.P. with
r
( multiply ratio)
<
1
{
|
a
|
,
|
b
|
,
|
c
|
<
1
}
⇒
Sum of infinite G.P.
∞
∑
n
=
0
a
n
=
1
1
−
a
Sum of infinite G.P.
∑
b
n
=
1
1
−
b
,
∑
c
n
=
1
1
−
c
⇒
1
x
=
1
−
a
,
1
y
=
1
−
b
,
1
z
=
1
−
c
⇒
1
y
−
1
x
=
a
−
b
,
1
z
−
1
y
=
b
−
c
As
a
,
b
,
c
are in
A
.
P
,
⇒
a
−
b
and
b
−
c
are equal
⇒
1
x
,
1
y
,
1
z
are in
A
.
P
.
⇒
x
,
y
,
z
are in
H
.
P
.
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17
Similar Questions
Q1
If
x
=
∑
∞
n
=
0
a
n
,
y
=
∑
∞
n
=
0
b
n
,
z
=
∑
∞
n
=
0
c
n
where a, b, c are in AP and
|
a
|
<
1
,
|
b
|
<
1
,
|
c
|
<
1
then x, y, z are in:
View Solution
Q2
If
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n
,
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where a, b, c, are in AP
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Q3
If
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|
<
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,
|
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|
<
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|
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Q4
If
0
<
a
,
b
,
c
<
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and
a
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b
,
c
are in A.P. and
x
=
∞
∑
n
=
0
a
n
,
y
=
∞
∑
n
=
0
b
n
,
z
=
∞
∑
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=
0
c
n
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,
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,
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are in
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Q5
If
x
=
∑
∞
n
=
0
a
n
,
y
=
∑
∞
n
=
0
b
n
,
z
=
∑
∞
n
=
0
c
n
,
where a , b , c are in A . P . such that |a |<1, |b| > <1 and |c| < 1 then show that x , y , z are in H . P
View Solution