17 26 37 50 ( ) A.63 B.61 C.67 D.65

作者: rantiku 人气: - 评论: 0

问题 17 26 37 50 ( ) A.63 B.61 C.67 D.65

选项

答案 D

解析该数列是二级等差数列，相邻两项的差为9,11,13，新数列是以2为公差的等差数列，即下一项为13＋2＝15，因此未知项为50＋15＝65。故选D。

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