Gaokao Math Practice Question
等差数列 $\left\{a_{n}\right\}$ 的首项为 1 , 公差不为 0 . 若 $a_{2}, a_{3}, a_{6}$ 成等比数列, 则 $\left\{a_{n}\right\}$ 前 6 项的和为 ($\qquad$)
- A.-24
- B.-3
- C.3
- D.8
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