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Mathematics
Mathematics
Problem
The sum of the first
n
n
n
terms of an arithmetic progression is given by
S
n
=
3
n
2
+
2
n
S_n = 3n^2 + 2n
S
n
=
3
n
2
+
2
n
. (a) Find its
n
n
n
th term
t
n
t_n
t
n
. (b) Determine its common difference.
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