Using mathematical induction, the value of 2 + 5 + 8 + ....+ (3n-1 ) comes out to be:

Using mathematical induction, the value of 2 + 5 + 8 + ....+ (3n-1 ) comes out to be:
1). $\frac{n(3n+1)}{2}$
2). $\frac{n(2n+1)}{3}$
3). $\frac{n(n+2)}{2}$
4). $\frac{n(3n-1)}{2}$

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