Arrange the positive integers into the following table according to certain rules: the first line 1, the second line 2 3, the third line 4 5 6, the fourth line 7 8 9 10. What's the 12th in line 2002?

Arrange the positive integers into the following table according to certain rules: the first line 1, the second line 2 3, the third line 4 5 6, the fourth line 7 8 9 10. What's the 12th in line 2002?

One in the first line, two in the second line, three in the third line, four in the fourth line, and one in the 2001 line
By 2001, there are 1 + 2 + 3 + +2001=2003001
The 12th in line 2002 is: 2003001 + 12 = 2003013

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