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Mathematics
Problem
The sum of the first eight terms in an arithmetic sequence,
a
n
\boldsymbol{a}_{\boldsymbol{n}}
a
n
, is 28 , and the sum of the first twelve terms in
a
n
\boldsymbol{a}_{\boldsymbol{n}}
a
n
is -30 . Determine an explicit formula for the arithmetic sequence,
a
n
\boldsymbol{a}_{\boldsymbol{n}}
a
n
.
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