Gaokao Math Practice Question
9. 记 $S_{n}$ 为等比数列 $\left\{a_{n}\right\}$ 的前 $n$ 项和. 若 $S_{2}=4, S_{4}=6$, 则 $S_{6}=(\quad)$
- A.7
- B.8
- C.9
- D.10
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