1.

The sequence of sets S_1,S_2,S_3,S_4,... is defined as S_1={1}, S_2={3,5}, S_3={7,9,11}, S_4={13,15,17,19}… etc. The first element of the nth set S_n is:

Answer»

`N `
`n^2 - 1`
`2N+ 1`
`n^2 - n + 1`

ANSWER :D


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