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. In which set, there are maximum number of prime number elements among S_1, S_2, S_3,....,S_13 is :

Answer»

`S_12`
`S_13`
`S_12` and `S_13`
`S_9,S_12,S_13`

ANSWER :D


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