Which expression represents the integral of the geometric series ∑n=0∞xn\sum_{n=0}^{\infty} x^n∑n=0∞xn?
∑n=1∞xnn\sum_{n=1}^{\infty} \frac{x^n}{n}∑n=1∞nxn
∑n=0∞xn+1\sum_{n=0}^{\infty} x^{n+1}∑n=0∞xn+1
∑n=0∞xn+1n\sum_{n=0}^{\infty} \frac{x^{n+1}}{n}∑n=0∞nxn+1
∑n=0∞xn+1n+1\sum_{n=0}^{\infty} \frac{x^{n+1}}{n+1}∑n=0∞n+1xn+1