Gaokao Math Practice Question
记 $S_{n}$ 为等差数列 $\left\{a_{n}\right\}$ 的前 $n$ 项和. 若 $3 S_{3}=S_{2}+S_{4}, a_{1}=2$, 则 $a_{5}=(\qquad)$
- A.-12
- B.-10
- C.10
- D.12
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