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C is 8 in the lower right corner and 2 in the upper right corner. What does this mean?
8 in the lower right corner represents the total number, and 2 in the upper right corner represents the number to be extracted. According to the query 520, official website shows that the upper right corner of the mathematical symbol C is 2 and the lower right corner is 8, which means combination in mathematics. 8 in the lower right corner represents the total number, 2 in the upper right corner represents the number to be extracted, and 2 is extracted from 8.
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