If `S_1={2}, S_2={3/2,4/2}, S_3={4/4,5/4,6/4},S_4={5/8,6/8,7/8,8/8}...`, then the sum of numbers in `S_20` is

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

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

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).

If N, the set of natural numbers is partitionaed 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 n C_(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} ,........ . Then the sum of the set S_(25) is

If A={1,2,3,4,5,6,7,8} and B={1,3,4,6,7,8,9} then

If U={1,2,3,4,5,6,7,8} , A = {2,4,6,8} and B={2,4,8} then: Write A’, B’ .

Let X ={1,2,3,4,5,6,7,8,9} A= {2,4,5,7,8}, B= {1,3,5,7}, C={4,6,8,9}, then A nn (BuuC)