a) [tex] \lim_{n \to \infty} \frac{1}{ n^{2} } [/tex](1+[tex] \frac{1}{ 2^{2} }+ \frac{1}{ 3^{2} }+...+ \frac{1}{ n^{2} } [/tex])=0

b)[tex] \lim_{n \to \infty} \frac{1}{n} [/tex](1+[tex] \frac{1}{2} + \frac{1}{ 2^{2} } +...+ \frac{1}{ 2^{n} } [/tex])=0