题目信息
A sequence is defined by$$ s_n = (s_{n – 1} – 1)(s_{n – 2})$$ for n > 2,and it has the starting values of$$ s_1 = 2$$ and $$s_4 = 9.$$ All terms are positive. Find the value of $$s_6$$.
A:54
B:117
C:171
D:207
E:279
参考答案及共享解析

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已选答案:
正确答案:
E:279
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题目来源
Magoosh