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解决排列组合问题,是正确地分类和分步.初学者往往辩别不清,得出一些貌似难确而实质错误的解法.有些错误具育很强的隐蔽性和欺骗性,如果不仔细分析研究,就很难发现真正原因,请看:
Solving the problem of permutation and combination is a correct classification and step-by-step. Beginners often discriminate and come up with solutions that seem to be difficult to determine and are actually wrong. Some errors are highly concealed and deceptive if they are not carefully analyzed. Research, it is difficult to find the real reason, see: