Which of these is the Taylor series of f(x)=ln(1+x)f(x) = \ln(1+x)f(x)=ln(1+x) centered at a=0a=0a=0?
∑n=1∞(−1)n+1xnn\sum_{n=1}^{\infty} \frac{(-1)^{n+1} x^n}{n}∑n=1∞n(−1)n+1xn
∑n=0∞(−1)nxnn\sum_{n=0}^{\infty} \frac{(-1)^n x^n}{n}∑n=0∞n(−1)nxn
∑n=1∞xnn\sum_{n=1}^{\infty} \frac{x^n}{n}∑n=1∞nxn
∑n=0∞xn\sum_{n=0}^{\infty} x^n∑n=0∞xn