[中學] 十個人分配到三間不同的房間的方法數
現在有十個人 甲,乙,丙.....欲以3人3人4人的方式分到三間不同的房間
規定甲,乙不住同一房,問分法有幾種?
答案是10240
這題好像不難,但我算出來總是跟答案不一樣! 請問該怎麼算呢?
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