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Gaokao Math Practice Question

将标号为 $1,2,3,4,5,6$ 的 6 张卡片放入 3 个不同的信封中, 若 每个信封放 2 张, 其中标号为 1,2 的卡片放入同一信封, 则不同的方法共 有 ($\qquad$)

  1. A.12 种
  2. B.18 种
  3. C.36 种
  4. D.54 种

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