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The sets S1,S2,S3, .......... are given ...

The sets `S_1,S_2,S_3,` .......... are given by `S_1={2/1},S_2={3/2,5/2},S_3={4/3,7/3(10)/3},S_4={5/4,9/4,(13)/4,(17)/4}, ddot` Then the sum of the numbers in the set `S_(25)` is 320 (b) 322 (c) 326 (d) 325

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