Quantitative Aptitude Progression Arithmetic Progression

If the nth term of an arithmetic progression is 7n - 2 then its sum to n terms is: 

1
\(\frac{1}{2}\left(7 n^2+2 \right)\)
2
7n2 - 3n  
3
\(\frac{1}{2}\left(7 n^2+3n \right)\)
4
7n2 - 2n 

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