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Byju's Answer
Standard XII
Mathematics
nth Term of A.P
The sum of ...
Question
The sum of
n
terms of an
A
P
is
3
n
2
+
5
n
. Find its
16
t
h
term.
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Solution
In
n
=
16
S
n
=
3
(
16
)
2
+
5
(
16
)
=
768
+
80
=
848
S
15
=
3
(
15
)
2
+
5
(
15
)
=
675
+
75
=
750
T
n
=
S
n
−
S
n
−
1
=
848
−
750
=
98
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