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(1) .Let Sn denote the sum of the first ...

`(1)` .Let `S_n` denote the sum of the first 'n' terms and `S_(2n)= 3S_n`. Then, the ratio `S_(3n):S_n` is: `(2)` let `S_1(n)` be the sum of the first n terms arithmetic progression `8, 12, 16,.....` and `S_2(n)` be the sum of the first n terms of arithmatic progression `17, 19, 21,.......` if `S_1(n)=S_2(n)` then this common sum is

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