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A set of dominoes (多米诺) consists of rectangular (矩形的) tiles each carrying two nu
A set of dominoes (多米诺) consists of rectangular (矩形的) tiles each carrying two nu
游客
2024-08-15
47
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问题
A set of dominoes (多米诺) consists of rectangular (矩形的) tiles each carrying two numbers from 0 to 6 which represented by patterns of spot. 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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答案
28
解析
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