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Let s1 , s2 , s3......... and t1 , t2 , ...

Let `s_1 , s_2 , s_3.........` and `t_1 , t_2 , t_3.......` are two arithmetic sequences such that `s_1 = t_1!=0, s_2=2t_2` and sum of first `10` terms of first `AP` equals to first `15`terms of second `AP` . Then the value of `(s_2-s_1)/(t_2-t_1)`

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