The sets S(1), S(2), S(3), …………. are giv...

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}`,........ . Then the sum of the set `S_(25)` is

320

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325

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