1,3,5,9,17,31,( )。A. 78 B. 65 C. 57 D. 46

作者: tihaiku 人气: - 评论: 0
问题 1,3,5,9,17,31,( )。
选项 A. 78 B. 65 C. 57 D. 46
答案 C
解析 此数列中,相邻三项的和等于第四项,即:1 + 3 + 5 = 9,3 + 5 + 9 = 17,5 + 9 + 17= 31,由此可推出下一项为:9 + 17 + 31 = 57。故本题答案为C。

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