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题型:选择题 题类:期中考试 难易度:中档
测
若\(\left\{{a}_{n}\right\} \)是等差数列,则下列数列中仍为等差数列的个数有\((\) \()\)
\(①\left\{2{a}_{n}+1\right\} \), \(②\left\{{{a}_{n}}^{2}\right\} \), \(③\left\{{a}_{n+1}-{a}_{n}\right\} \), \(④\left\{2{a}_{n}+n\right\} \)
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