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Speaking of difficult, difficult, difficult, difficult, difficult, difficult, difficult, difficult, difficult, difficult, difficult, difficult, difficult math problems.
This is an arithmetic series. If you haven't learned it, ask for 6+8+ 10+. . . . +26+28+30 (and then refer to Gaussian algorithm, the first term+the last term) is 6+30=8+28= 10+26=. . =36 A * * * There are 6 pairs, plus 18, it is 234.