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Problem
Problem
The 12th term of an arithmetic sequence,
a
12
a_{12}
a
12
, is twice as large as the 4th term in the sequence,
a
4
a_4
a
4
. a. Given
a
14
=
27
a_{14} = 27
a
14
=
27
, find the value of
a
1
a_1
a
1
. b. Find the 20th partial sum of this sequence.
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