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[Problem Solving]
试题详情
题目:
The infinite sequence
a
1
,
a
2
,…,
a
n
,… is such that
a
1
= 2,
a
2
= -3,
a
3
= 5,
a
4
= -1, and
a
n
=
a
n-4
for n
>
4. What is the sum of the first 97 terms of the sequence?