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The 20 people at a party are divided into n mutually exclusive groups in such a way that the number of people in any group does not exceed the number in any other group by more than 1.
The value of n if at least one of the groups consists of 3 people
6
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当前版本由 王二亿 更新于2019-07-11 15:30:19 感谢由 王二亿 对此题目的解答所做出的贡献。
没法比 可以是 6个3和1个2 共七组,大于6 可以是 4个3和2个4 共六组,等于6 所以无法比较
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吃天空
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USCIS
这题应该属于不等式不是排列组合 求最小值：至少有3组，假设极端情况n=1，满足题干 求最大值应该是一堆2和最少量的3 那么就应该是满足2x+3y=20的整数解里x+y的最大值 先确定整数解范围: 20=2x+3y=>2x+2y x+y<=10 20=2x+3y<=3x+3y, y="">=7 x+y的范围可以取7 8 9比6大 试一试可以确定最大范围是9 所以6在1～9里 选D
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Lillian5991
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nb
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感谢
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nb
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nb
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24组合的话，应该有三种情况
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kylin0516
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至少有一个3的情况下其他组的个数不大于4，不小于2. 但无法确定到底是为2 还是为4（因为2和4不可能同时存在），所以组数也无法确定。
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