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Byju's Answer
Standard XII
Mathematics
Logarithmic Differentiation
If a, b, c ...
Question
If
a
,
b
,
c
are in GP and
a
x
=
b
y
=
c
z
, then
x
,
y
,
z
will be in.
A
AP
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B
GP
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C
HP
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D
None of these
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Solution
The correct option is
C
HP
Given
a
,
b
,
c
ϵ
G.P
b
2
=
a
c
Taking
log
we get,
2
log
b
=
log
a
+
log
c
.
.
(
1
)
Also given,
a
x
=
b
y
=
c
z
or
x
log
a
=
y
log
b
=
z
log
c
=
k
(
s
a
y
)
Now using (1), we get
2.
k
y
=
k
x
+
k
z
⇒
2
y
=
1
x
+
1
z
⇒
x
,
y
,
z
ϵ
H.P
Hence, option 'C' is correct.
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