排列组合问题,有7个小球4个盒子将7个小球放入4个盒子中,每个盒子中至少有1 个球.问在下列4种情况中共有多少种放法?①小球相同,盒子相同②小球不同,例子相同③小球相同,盒子不同④小球
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![排列组合问题,有7个小球4个盒子将7个小球放入4个盒子中,每个盒子中至少有1 个球.问在下列4种情况中共有多少种放法?①小球相同,盒子相同②小球不同,例子相同③小球相同,盒子不同④小球](/uploads/image/z/14762840-32-0.jpg?t=%E6%8E%92%E5%88%97%E7%BB%84%E5%90%88%E9%97%AE%E9%A2%98%2C%E6%9C%897%E4%B8%AA%E5%B0%8F%E7%90%834%E4%B8%AA%E7%9B%92%E5%AD%90%E5%B0%867%E4%B8%AA%E5%B0%8F%E7%90%83%E6%94%BE%E5%85%A54%E4%B8%AA%E7%9B%92%E5%AD%90%E4%B8%AD%2C%E6%AF%8F%E4%B8%AA%E7%9B%92%E5%AD%90%E4%B8%AD%E8%87%B3%E5%B0%91%E6%9C%891+%E4%B8%AA%E7%90%83.%E9%97%AE%E5%9C%A8%E4%B8%8B%E5%88%974%E7%A7%8D%E6%83%85%E5%86%B5%E4%B8%AD%E5%85%B1%E6%9C%89%E5%A4%9A%E5%B0%91%E7%A7%8D%E6%94%BE%E6%B3%95%3F%E2%91%A0%E5%B0%8F%E7%90%83%E7%9B%B8%E5%90%8C%2C%E7%9B%92%E5%AD%90%E7%9B%B8%E5%90%8C%E2%91%A1%E5%B0%8F%E7%90%83%E4%B8%8D%E5%90%8C%2C%E4%BE%8B%E5%AD%90%E7%9B%B8%E5%90%8C%E2%91%A2%E5%B0%8F%E7%90%83%E7%9B%B8%E5%90%8C%2C%E7%9B%92%E5%AD%90%E4%B8%8D%E5%90%8C%E2%91%A3%E5%B0%8F%E7%90%83)
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