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Gaokao Math Practice Question

我国古代数学名著《算法统宗》中有如下问题: “远看巍巍塔七层, 红光点点倍加增, 共灯三百八十一, 请问尖头几或灯?"意思是: 一座 7 层 塔共挂了 381 盏灯, 且相邻两层中的下一层灯数是上一层灯数的 2 倍, 则塔 的顶层共有灯 ($\qquad$)

  1. A.1 盏
  2. B.3 或
  3. C.5 盏
  4. D.9 盏

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