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一道组合题:从6双鞋中选4只鞋,恰好有一双鞋的选法有多少种?本题有多种解法,体现了不同的思维角度,体现了解答组合题的规律性.本文给出它的七种解法,供大家研究参考.解法1在6双鞋中选1双有C16种选法.再在剩下的5双鞋中选2只(不同双),我们可以先选1只有C110种方法,再选1只(不能
A combination of questions: from the 6 pairs of shoes selected 4 shoes, just how many kinds of shoes there are a variety of selection? There are a variety of solutions to this problem, reflecting a different point of view, reflects the regularity of the answer combination questions. This article gives it The seven solutions are available for everyone’s reference. Solution 1 In the 6 pairs of shoes, select 1 pair with C16 selections. Then select 2 of the remaining 5 pairs of shoes (different doubles). We can select 1 for only C110 methods. , choose another one (can’t