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Gaokao Math Practice Question

等比数列 $\left\{a_{n}\right\}$ 的公比为 $q$, 前 $n$ 项和为 $S_{n}$, 设甲: $q>0$, 乙: $\left\{S_{n}\right\}$ 是递增数列, 则 ($\quad$)

  1. A.甲是乙的充分条件但不是必要条件
  2. B.甲是乙的必要条件但不是充分条件
  3. C.甲是乙的充要条件
  4. D.甲既不是乙的充分条件也不是乙的必要条件

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