1.

For any natural number n the sets S_1, S_2,….. are defined as below: S_1 = {1} . S_2 = {2,3}, S_ 3 = {4,5,6} S_4 = {7,8,9,10}, S_5 = {11,12,13,14,15}:etc. On which set the sum of all the elements of the set is even :

Answer»

a. `S_(39)`
b. `S_(50)`
c. `S_(72)`
d. `S_(94)`

Answer :C


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