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A set dominoes(多米诺) consists of rectangular (矩形的) tiles each carrying two numbers from 0 to 6 which represented by patterns of spots. Every possible pairing of numbers occurs just once including each number with itself. How many dominoes are there in a set?
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解析：
该题是一个排列组合题，从0至6共7个数字任意选出两个数字，共有21种组合，除此之外，每个数字还可以跟自己组合，共有7种组合，加在一起共28种组合。
该题是一个排列组合题，从0至6共7个数字任意选出两个数字，共有21种组合，除此之外，每个数字还可以跟自己组合，共有7种组合，加在一起共28种组合。
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