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Mathematics
Mathematics
Problem
In an arithmetic progression the sum of the first
n
n
n
terms is
S
n
=
4
n
2
+
n
S_n = 4n^2 + n
S
n
=
4
n
2
+
n
. What is the common difference of the progression? a)
9
9
9
b)
8
8
8
c)
4
4
4
d)
13
13
13
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