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CBSE XI
>>
Math
>>
Sequences and Series
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Q)
If
f
is a function satisfying
f
(
x
+
y
)
=
f
(
x
)
.
f
(
y
)
∀
x
,
y
∈
N
such that
f
(
1
)
=
3
a
n
d
n
∑
x
=
1
f
(
x
)
=
120
, then find the value of
n
.
3
4
5
6
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