Let $s 1, s 2, s s_{3000-u s 10}$ respectively be the sum to 12 terms of 10 A.P.s whose first terms are $1,2,3, \ldots \mathrm{u}$ 10 and the common differences are $1,3,5, \ldots, 19$ respectively. Then $\sum_{i=1}^{10} s_i$ is equal to-
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