1 , 2 , 2 , 6 , 3 , 15 , 3 , 21 , 4 ,（）A.46 B.20 C.12 D.44

作者: tihaiku 人气: - 评论: 0

问题 1 , 2 , 2 , 6 , 3 , 15 , 3 , 21 , 4 ,（）

选项 A.46 B.20 C.12 D.44

答案 D

解析奇数项：1,2,3,3,4…… 偶数项：2,6,15,21,() …… 倍数：2,3,5,7,11,13,17…… 偶数项是奇数项的2倍 3倍 5倍 7倍 11倍 13倍…… 倍数呈素数倍递增括号项应该是4的11倍,所以是44

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