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1. Position of a fraction in a sequence ●●●○○ 50 ptsThe positive rational numbers are arranged in the order $\frac{1}{1}, \frac{2}{1}, \frac{1}{2}, \frac{3}{1}, \frac{2}{2}, \frac{1}{3}, \frac{4}{1}, \frac{3}{2}, \frac{2}{3}, \frac{1}{4}, \cdots$. Find the position number of the number $\frac{1989}{1949}$ in this sequence.