1, 3, 5, 11, 21, ( ), 85。A. 33 B. 41 C. 43 D. 53
答案:C解析:1X2 + 1 = 3,3X2 -1 = 5,5X2 + 1 = 11,11X2 -1 = 21,因此空缺项为 21X2 + 1 = 43。
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