GMAT 考满分题库

Magoosh - 数学PS - 396
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 $$s_6$$.
  • A54
  • B117
  • C171
  • D207
  • E279
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正确答案: E

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