第n排有n个数,且个相邻排数的个数构成等差数列,则前n排共有（n+1）*n/2个数,令（n+1）*n/2=320求出n,得24点多,意味着320在25排里,二（n+1）*n/2中n取24时等于300,即24排最后个数是300,而25排最后为300+25>320,则320在25排第20个数
row 25
position 20
一道英语奥数题If you continue the given number pattern,in what row
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