If `S_1 = {2}, S_2 = {3,6}, S_3 = {4,8,16},S_4 = {5,10,20,40} .......` then the sum of numbers in the set `S_15` is

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

If N, the set of natural numbers is partitioned into groups S_(1)={1},S_(2)={2,3},S_(3)={4,5,6,7},S_(4)={8,9,10,11,12,13,14,15},"....", find the sum of the numbers in S_(50).

If N, the set of natural numbers is partitioned into groups S_(1)={1},S_(2)={2,3},S_(3)={4,5,6,7},S_(4)={8,9,10,11,12,13,14,15},"....", find the sum of the numbers in S_(50).

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