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Problem
Problem
k
−
1
k - 1
k
−
1
,
2
k
+
3
2k + 3
2
k
+
3
, and
27
−
k
27 - k
27
−
k
are the first three terms of an arithmetic sequence. a. Find
k
k
k
. b. Find the sum of the first 25 terms of the sequence.
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