排列组合题目一条长椅上有9个座位,3个人坐,若相邻2人之间至少有2个空椅子,共有几种不同的坐法?正解为60种,请各位思考原因!!
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![排列组合题目一条长椅上有9个座位,3个人坐,若相邻2人之间至少有2个空椅子,共有几种不同的坐法?正解为60种,请各位思考原因!!](/uploads/image/z/1756609-25-9.jpg?t=%E6%8E%92%E5%88%97%E7%BB%84%E5%90%88%E9%A2%98%E7%9B%AE%E4%B8%80%E6%9D%A1%E9%95%BF%E6%A4%85%E4%B8%8A%E6%9C%899%E4%B8%AA%E5%BA%A7%E4%BD%8D%2C3%E4%B8%AA%E4%BA%BA%E5%9D%90%2C%E8%8B%A5%E7%9B%B8%E9%82%BB2%E4%BA%BA%E4%B9%8B%E9%97%B4%E8%87%B3%E5%B0%91%E6%9C%892%E4%B8%AA%E7%A9%BA%E6%A4%85%E5%AD%90%2C%E5%85%B1%E6%9C%89%E5%87%A0%E7%A7%8D%E4%B8%8D%E5%90%8C%E7%9A%84%E5%9D%90%E6%B3%95%3F%E6%AD%A3%E8%A7%A3%E4%B8%BA60%E7%A7%8D%EF%BC%8C%E8%AF%B7%E5%90%84%E4%BD%8D%E6%80%9D%E8%80%83%E5%8E%9F%E5%9B%A0%EF%BC%81%EF%BC%81)
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