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将字母 $a, a, b, b, c, c$ 排成三行两列, 要求每行的字母互不相 同, 每列的字母也互不相同, 则不同的排列方法共有 ($\qquad$)

Gaokao · Math · previous-year question

  1. A.12 种
  2. B.18 种
  3. C.24 种
  4. D.36 种

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