题目信息
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?
A:72
B:74
C:75
D:78
E:80
参考答案及共享解析

共享解析来源为网络权威资源、GMAT高分考生等; 如有疑问,欢迎在评论区提问与讨论
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已选答案:
正确答案:
B:74
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