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Mathematics, 12.07.2019 18:00 jayc36809

In a set of dominoes, each piece is marked with two numbers, one on each end. the pieces are symmetrical so that the two numbers are unordered. that is, the combination (2, 6) and (6, 2) are not distinguishable. how many pieces can be formed using the numbers 1, 2, , 12?

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