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Byju's Answer
Standard XIII
Mathematics
Logarithms
If log10a12=l...
Question
If
log
10
a
12
=
log
10
b
21
=
log
10
c
15
,
then
b
c
is equal to
A
a
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B
a
2
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C
a
3
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D
a
4
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Solution
The correct option is
C
a
3
Let
log
10
a
12
=
log
10
b
21
=
log
10
c
15
=
k
Then,
a
=
10
12
k
,
b
=
10
21
k
,
c
=
10
15
k
∴
b
c
=
10
36
k
=
(
10
12
k
)
3
=
a
3
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0
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