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Mathematics
Problem
Determine the first term and common difference of an arithmetic sequence where the sum of the first
n
n
n
terms is given by
S
n
=
∑
r
=
1
n
(
5
r
+
11
)
S_n = \sum_{r=1}^{n} (5r + 11)
S
n
=
∑
r
=
1
n
(
5
r
+
11
)
.
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